GET https://kbin.spritesserver.nl/m/askelectronics@discuss.tchncs.de/t/31624/Do-both-sides-of-a-transformer-need-to-be-fused/active

Response
200 OK
IP
216.73.216.122
Profiled on
Token
c8e57a

Security

Token

There is no security token.

Firewall

main Name
Security enabled
Stateless

Configuration

Key Value
provider security.user.provider.concrete.app_user_provider
context main
entry_point App\Security\KbinAuthenticator
user_checker App\Security\UserChecker
access_denied_handler (none)
access_denied_url (none)
authenticators 
[
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  "remember_me"
  "App\Security\KbinAuthenticator"
  "App\Security\FacebookAuthenticator"
  "App\Security\GoogleAuthenticator"
  "App\Security\GithubAuthenticator"
  "App\Security\KeycloakAuthenticator"
]

Listeners

Listener Duration Response 
Symfony\Component\Security\Http\Firewall\ChannelListener {#723
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  -logger: Monolog\Logger {#783 …}
  -httpPort: 80
  -httpsPort: 443
}
 0.00 ms (none) 
Symfony\Component\Security\Http\Firewall\ContextListener {#706
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  -sessionKey: "_security_main"
  -logger: Monolog\Logger {#783 …}
  -userProviders: Symfony\Component\DependencyInjection\Argument\RewindableGenerator {#705 …}
  -dispatcher: Symfony\Component\EventDispatcher\Debug\TraceableEventDispatcher {#747 …}
  -registered: false
  -trustResolver: Scheb\TwoFactorBundle\Security\Authentication\AuthenticationTrustResolver {#780 …}
  -sessionTrackerEnabler: Symfony\Component\Security\Core\Authentication\Token\Storage\UsageTrackingTokenStorage::enableUsageTracking(): void {#703 …}
}
 8.96 ms (none) 
Symfony\Component\Security\Http\Firewall\AuthenticatorManagerListener {#584
  -authenticatorManager: Symfony\Component\Security\Http\Authentication\AuthenticatorManager {#595 …}
}
 0.00 ms (none) 
Scheb\TwoFactorBundle\Security\Http\Firewall\TwoFactorAccessListener {#582
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  -tokenStorage: Symfony\Component\Security\Core\Authentication\Token\Storage\UsageTrackingTokenStorage {#1018 …}
  -twoFactorAccessDecider: Scheb\TwoFactorBundle\Security\Authorization\TwoFactorAccessDecider {#581 …}
}
 0.05 ms (none) 
Symfony\Component\Security\Http\Firewall\AccessListener {#579
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  -accessDecisionManager: Symfony\Component\Security\Core\Authorization\TraceableAccessDecisionManager {#937 …}
  -map: Symfony\Component\Security\Http\AccessMap {#722 …}
}
 0.00 ms (none) 
Symfony\Component\Security\Http\Firewall\LogoutListener {#786
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    "logout_path" => "app_logout"
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}
 0.00 ms (none)

Authenticators

No authenticators have been recorded. Check previous profiles on your authentication endpoint.

Access Decision

affirmative Strategy
# Voter class
1 
"Symfony\Component\Security\Core\Authorization\Voter\AuthenticatedVoter"
2 
"Scheb\TwoFactorBundle\Security\Authorization\Voter\TwoFactorInProgressVoter"
3 
"Symfony\Component\Security\Core\Authorization\Voter\RoleHierarchyVoter"
4 
"Symfony\Component\Security\Core\Authorization\Voter\ExpressionVoter"
5 
"App\Security\Voter\EntryCommentVoter"
6 
"App\Security\Voter\EntryVoter"
7 
"App\Security\Voter\MagazineVoter"
8 
"App\Security\Voter\MessageThreadVoter"
9 
"App\Security\Voter\MessageVoter"
10 
"App\Security\Voter\NotificationVoter"
11 
"App\Security\Voter\OAuth2UserConsentVoter"
12 
"App\Security\Voter\PostCommentVoter"
13 
"App\Security\Voter\PostVoter"
14 
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Access decision log

# Result Attributes Object
1 DENIED ROLE_USER 
null
 
"Scheb\TwoFactorBundle\Security\Authorization\Voter\TwoFactorInProgressVoter"
 ACCESS ABSTAIN 
"Symfony\Component\Security\Core\Authorization\Voter\RoleHierarchyVoter"
 ACCESS DENIED 
"App\Security\Voter\EntryCommentVoter"
 ACCESS ABSTAIN 
"App\Security\Voter\EntryVoter"
 ACCESS ABSTAIN 
"App\Security\Voter\MagazineVoter"
 ACCESS ABSTAIN 
"App\Security\Voter\MessageThreadVoter"
 ACCESS ABSTAIN 
"App\Security\Voter\MessageVoter"
 ACCESS ABSTAIN 
"App\Security\Voter\NotificationVoter"
 ACCESS ABSTAIN 
"App\Security\Voter\OAuth2UserConsentVoter"
 ACCESS ABSTAIN 
"App\Security\Voter\PostCommentVoter"
 ACCESS ABSTAIN 
"App\Security\Voter\PostVoter"
 ACCESS ABSTAIN 
"App\Security\Voter\UserVoter"
 ACCESS ABSTAIN
Show voter details
2 DENIED moderate 
App\Entity\Entry {#2419
  +user: Proxies\__CG__\App\Entity\User {#1970 …}
  +magazine: App\Entity\Magazine {#265
    +icon: Proxies\__CG__\App\Entity\Image {#246 …}
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      **For questions about component-level electronic circuits, tools and equipment.**\n
      \n
      Rules\n
      -----\n
      \n
      1: Be nice.\n
      \n
      2: Be on-topic (eg: *Electronic*, not *electrical*).\n
      \n
      3: No commercial stuff, buying, selling or valuations.\n
      \n
      4: Be safe.\n
      \n
      ---
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  +domain: Proxies\__CG__\App\Entity\Domain {#1915 …}
  +slug: "Do-both-sides-of-a-transformer-need-to-be-fused"
  +title: "Do both sides of a transformer need to be fused?"
  +url: null
  +body: """
    I work on equipment that runs off 3 phase 208V but it uses uses a transformer to drop it down to 120V for most of the controls. On this equipment I noticed that there are two fuses on the lines exclusively feeding the 208V side of the transformer and a fuse directly off of the hot side on the 120V side of the transformer.\n
    \n
    Isn’t the fuse on the 120V side of the transformer redundant? From my understanding, if there is a current spike on the 120V side of the transformer then that will cause a current spike on the 208V side of the transformer and immediately blow those fuses anyways. Is this just a certification thing where that redundancy is required? I’m in the US but this equipment does also get shipped to various overseas locations. Also, while it isn’t standard, this equipment is capable of passing a TUV inspection if a customer requests it so I’m not sure if the potentially redundant fuse is just a TUV requirement.
    """
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  +ip: null
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  +mentions: null
  +comments: Doctrine\ORM\PersistentCollection {#1884 …}
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  +favourites: Doctrine\ORM\PersistentCollection {#1927 …}
  +notifications: Doctrine\ORM\PersistentCollection {#2442 …}
  +badges: Doctrine\ORM\PersistentCollection {#2440 …}
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"Scheb\TwoFactorBundle\Security\Authorization\Voter\TwoFactorInProgressVoter"
 ACCESS ABSTAIN 
"App\Security\Voter\EntryCommentVoter"
 ACCESS ABSTAIN 
"App\Security\Voter\EntryVoter"
 ACCESS DENIED 
"App\Security\Voter\MagazineVoter"
 ACCESS ABSTAIN 
"App\Security\Voter\MessageThreadVoter"
 ACCESS ABSTAIN 
"App\Security\Voter\MessageVoter"
 ACCESS ABSTAIN 
"App\Security\Voter\NotificationVoter"
 ACCESS ABSTAIN 
"App\Security\Voter\OAuth2UserConsentVoter"
 ACCESS ABSTAIN 
"App\Security\Voter\PostCommentVoter"
 ACCESS ABSTAIN 
"App\Security\Voter\PostVoter"
 ACCESS ABSTAIN 
"App\Security\Voter\UserVoter"
 ACCESS ABSTAIN
Show voter details
3 DENIED edit 
App\Entity\Entry {#2419
  +user: Proxies\__CG__\App\Entity\User {#1970 …}
  +magazine: App\Entity\Magazine {#265
    +icon: Proxies\__CG__\App\Entity\Image {#246 …}
    +name: "askelectronics@discuss.tchncs.de"
    +title: "askelectronics"
    +description: """
      **For questions about component-level electronic circuits, tools and equipment.**\n
      \n
      Rules\n
      -----\n
      \n
      1: Be nice.\n
      \n
      2: Be on-topic (eg: *Electronic*, not *electrical*).\n
      \n
      3: No commercial stuff, buying, selling or valuations.\n
      \n
      4: Be safe.\n
      \n
      ---
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      date: 2024-10-20 10:40:08.0 +02:00
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    +moderators: Doctrine\ORM\PersistentCollection {#237 …}
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      date: 2023-06-19 05:13:29.0 +02:00
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  +domain: Proxies\__CG__\App\Entity\Domain {#1915 …}
  +slug: "Do-both-sides-of-a-transformer-need-to-be-fused"
  +title: "Do both sides of a transformer need to be fused?"
  +url: null
  +body: """
    I work on equipment that runs off 3 phase 208V but it uses uses a transformer to drop it down to 120V for most of the controls. On this equipment I noticed that there are two fuses on the lines exclusively feeding the 208V side of the transformer and a fuse directly off of the hot side on the 120V side of the transformer.\n
    \n
    Isn’t the fuse on the 120V side of the transformer redundant? From my understanding, if there is a current spike on the 120V side of the transformer then that will cause a current spike on the 208V side of the transformer and immediately blow those fuses anyways. Is this just a certification thing where that redundancy is required? I’m in the US but this equipment does also get shipped to various overseas locations. Also, while it isn’t standard, this equipment is capable of passing a TUV inspection if a customer requests it so I’m not sure if the potentially redundant fuse is just a TUV requirement.
    """
  +type: "article"
  +lang: "en"
  +isOc: false
  +hasEmbed: false
  +commentCount: 2
  +favouriteCount: 12
  +score: 0
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    date: 2024-09-17 06:27:01.0 +02:00
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  +ip: null
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  +reports: Doctrine\ORM\PersistentCollection {#1959 …}
  +favourites: Doctrine\ORM\PersistentCollection {#1927 …}
  +notifications: Doctrine\ORM\PersistentCollection {#2442 …}
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"Scheb\TwoFactorBundle\Security\Authorization\Voter\TwoFactorInProgressVoter"
 ACCESS ABSTAIN 
"App\Security\Voter\EntryCommentVoter"
 ACCESS ABSTAIN 
"App\Security\Voter\EntryVoter"
 ACCESS DENIED 
"App\Security\Voter\MagazineVoter"
 ACCESS ABSTAIN 
"App\Security\Voter\MessageThreadVoter"
 ACCESS ABSTAIN 
"App\Security\Voter\MessageVoter"
 ACCESS ABSTAIN 
"App\Security\Voter\NotificationVoter"
 ACCESS ABSTAIN 
"App\Security\Voter\OAuth2UserConsentVoter"
 ACCESS ABSTAIN 
"App\Security\Voter\PostCommentVoter"
 ACCESS ABSTAIN 
"App\Security\Voter\PostVoter"
 ACCESS ABSTAIN 
"App\Security\Voter\UserVoter"
 ACCESS ABSTAIN
Show voter details
4 DENIED moderate 
App\Entity\Entry {#2419
  +user: Proxies\__CG__\App\Entity\User {#1970 …}
  +magazine: App\Entity\Magazine {#265
    +icon: Proxies\__CG__\App\Entity\Image {#246 …}
    +name: "askelectronics@discuss.tchncs.de"
    +title: "askelectronics"
    +description: """
      **For questions about component-level electronic circuits, tools and equipment.**\n
      \n
      Rules\n
      -----\n
      \n
      1: Be nice.\n
      \n
      2: Be on-topic (eg: *Electronic*, not *electrical*).\n
      \n
      3: No commercial stuff, buying, selling or valuations.\n
      \n
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  +domain: Proxies\__CG__\App\Entity\Domain {#1915 …}
  +slug: "Do-both-sides-of-a-transformer-need-to-be-fused"
  +title: "Do both sides of a transformer need to be fused?"
  +url: null
  +body: """
    I work on equipment that runs off 3 phase 208V but it uses uses a transformer to drop it down to 120V for most of the controls. On this equipment I noticed that there are two fuses on the lines exclusively feeding the 208V side of the transformer and a fuse directly off of the hot side on the 120V side of the transformer.\n
    \n
    Isn’t the fuse on the 120V side of the transformer redundant? From my understanding, if there is a current spike on the 120V side of the transformer then that will cause a current spike on the 208V side of the transformer and immediately blow those fuses anyways. Is this just a certification thing where that redundancy is required? I’m in the US but this equipment does also get shipped to various overseas locations. Also, while it isn’t standard, this equipment is capable of passing a TUV inspection if a customer requests it so I’m not sure if the potentially redundant fuse is just a TUV requirement.
    """
  +type: "article"
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  +ip: null
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  -id: 31624
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}
 
"Scheb\TwoFactorBundle\Security\Authorization\Voter\TwoFactorInProgressVoter"
 ACCESS ABSTAIN 
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      I work on equipment that runs off 3 phase 208V but it uses uses a transformer to drop it down to 120V for most of the controls. On this equipment I noticed that there are two fuses on the lines exclusively feeding the 208V side of the transformer and a fuse directly off of the hot side on the 120V side of the transformer.\n
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      Isn’t the fuse on the 120V side of the transformer redundant? From my understanding, if there is a current spike on the 120V side of the transformer then that will cause a current spike on the 208V side of the transformer and immediately blow those fuses anyways. Is this just a certification thing where that redundancy is required? I’m in the US but this equipment does also get shipped to various overseas locations. Also, while it isn’t standard, this equipment is capable of passing a TUV inspection if a customer requests it so I’m not sure if the potentially redundant fuse is just a TUV requirement.
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    My Electromagnetics is a bit rusty, apply a healthy measure of skepticism:\n
    \n
    I’d say the two fuses are there to protect the transformer itself.\n
    \n
    In the example you use, the upstream of the transformer would be protected by the 280V fuses but the transformer itself will have to suffer the overcurrent, and could be damaged by it. If the transformer is dipped in cooling oil, the overcurrent could even lead to an explosion.\n
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7 DENIED edit 
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        Rules\n
        -----\n
        \n
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      I work on equipment that runs off 3 phase 208V but it uses uses a transformer to drop it down to 120V for most of the controls. On this equipment I noticed that there are two fuses on the lines exclusively feeding the 208V side of the transformer and a fuse directly off of the hot side on the 120V side of the transformer.\n
      \n
      Isn’t the fuse on the 120V side of the transformer redundant? From my understanding, if there is a current spike on the 120V side of the transformer then that will cause a current spike on the 208V side of the transformer and immediately blow those fuses anyways. Is this just a certification thing where that redundancy is required? I’m in the US but this equipment does also get shipped to various overseas locations. Also, while it isn’t standard, this equipment is capable of passing a TUV inspection if a customer requests it so I’m not sure if the potentially redundant fuse is just a TUV requirement.
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    My Electromagnetics is a bit rusty, apply a healthy measure of skepticism:\n
    \n
    I’d say the two fuses are there to protect the transformer itself.\n
    \n
    In the example you use, the upstream of the transformer would be protected by the 280V fuses but the transformer itself will have to suffer the overcurrent, and could be damaged by it. If the transformer is dipped in cooling oil, the overcurrent could even lead to an explosion.\n
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    As for the TUV inspection, the two fuses would be desirable for any TUV cert, and they would be required if there is any chance of explosion.
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        Rules\n
        -----\n
        \n
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      I work on equipment that runs off 3 phase 208V but it uses uses a transformer to drop it down to 120V for most of the controls. On this equipment I noticed that there are two fuses on the lines exclusively feeding the 208V side of the transformer and a fuse directly off of the hot side on the 120V side of the transformer.\n
      \n
      Isn’t the fuse on the 120V side of the transformer redundant? From my understanding, if there is a current spike on the 120V side of the transformer then that will cause a current spike on the 208V side of the transformer and immediately blow those fuses anyways. Is this just a certification thing where that redundancy is required? I’m in the US but this equipment does also get shipped to various overseas locations. Also, while it isn’t standard, this equipment is capable of passing a TUV inspection if a customer requests it so I’m not sure if the potentially redundant fuse is just a TUV requirement.
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    My Electromagnetics is a bit rusty, apply a healthy measure of skepticism:\n
    \n
    I’d say the two fuses are there to protect the transformer itself.\n
    \n
    In the example you use, the upstream of the transformer would be protected by the 280V fuses but the transformer itself will have to suffer the overcurrent, and could be damaged by it. If the transformer is dipped in cooling oil, the overcurrent could even lead to an explosion.\n
    \n
    As for the TUV inspection, the two fuses would be desirable for any TUV cert, and they would be required if there is any chance of explosion.
    """
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      I work on equipment that runs off 3 phase 208V but it uses uses a transformer to drop it down to 120V for most of the controls. On this equipment I noticed that there are two fuses on the lines exclusively feeding the 208V side of the transformer and a fuse directly off of the hot side on the 120V side of the transformer.\n
      \n
      Isn’t the fuse on the 120V side of the transformer redundant? From my understanding, if there is a current spike on the 120V side of the transformer then that will cause a current spike on the 208V side of the transformer and immediately blow those fuses anyways. Is this just a certification thing where that redundancy is required? I’m in the US but this equipment does also get shipped to various overseas locations. Also, while it isn’t standard, this equipment is capable of passing a TUV inspection if a customer requests it so I’m not sure if the potentially redundant fuse is just a TUV requirement.
      """
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      My Electromagnetics is a bit rusty, apply a healthy measure of skepticism:\n
      \n
      I’d say the two fuses are there to protect the transformer itself.\n
      \n
      In the example you use, the upstream of the transformer would be protected by the 280V fuses but the transformer itself will have to suffer the overcurrent, and could be damaged by it. If the transformer is dipped in cooling oil, the overcurrent could even lead to an explosion.\n
      \n
      As for the TUV inspection, the two fuses would be desirable for any TUV cert, and they would be required if there is any chance of explosion.
      """
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  +body: """
    Definitely no chance of an explosion here. I’m not sure what the transformer is rated at off the top of my head but it is fused at 3A on the low voltage side and 2A on the high voltage side and I know it is rated for well over that. It’s a pretty beefy (5-10lb air cooled) transformer for the all of 0.5-1A it actually typically supplies on this machine.\n
    \n
    I am actually leaning towards TUV being the explanation though because your comment just reminded me that we actually got dinged by them before on a different piece of equipment because we didn’t have fuses on the DC side of a DC power supply despite the AC side having a fairly restrictive fuse directly upstream of that power supply which should have prevented any catostrophic failure on its own. I’m willing to bet the rules are the same for transformers.
    """
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        -----\n
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      I work on equipment that runs off 3 phase 208V but it uses uses a transformer to drop it down to 120V for most of the controls. On this equipment I noticed that there are two fuses on the lines exclusively feeding the 208V side of the transformer and a fuse directly off of the hot side on the 120V side of the transformer.\n
      \n
      Isn’t the fuse on the 120V side of the transformer redundant? From my understanding, if there is a current spike on the 120V side of the transformer then that will cause a current spike on the 208V side of the transformer and immediately blow those fuses anyways. Is this just a certification thing where that redundancy is required? I’m in the US but this equipment does also get shipped to various overseas locations. Also, while it isn’t standard, this equipment is capable of passing a TUV inspection if a customer requests it so I’m not sure if the potentially redundant fuse is just a TUV requirement.
      """
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      My Electromagnetics is a bit rusty, apply a healthy measure of skepticism:\n
      \n
      I’d say the two fuses are there to protect the transformer itself.\n
      \n
      In the example you use, the upstream of the transformer would be protected by the 280V fuses but the transformer itself will have to suffer the overcurrent, and could be damaged by it. If the transformer is dipped in cooling oil, the overcurrent could even lead to an explosion.\n
      \n
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      """
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    Definitely no chance of an explosion here. I’m not sure what the transformer is rated at off the top of my head but it is fused at 3A on the low voltage side and 2A on the high voltage side and I know it is rated for well over that. It’s a pretty beefy (5-10lb air cooled) transformer for the all of 0.5-1A it actually typically supplies on this machine.\n
    \n
    I am actually leaning towards TUV being the explanation though because your comment just reminded me that we actually got dinged by them before on a different piece of equipment because we didn’t have fuses on the DC side of a DC power supply despite the AC side having a fairly restrictive fuse directly upstream of that power supply which should have prevented any catostrophic failure on its own. I’m willing to bet the rules are the same for transformers.
    """
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      I work on equipment that runs off 3 phase 208V but it uses uses a transformer to drop it down to 120V for most of the controls. On this equipment I noticed that there are two fuses on the lines exclusively feeding the 208V side of the transformer and a fuse directly off of the hot side on the 120V side of the transformer.\n
      \n
      Isn’t the fuse on the 120V side of the transformer redundant? From my understanding, if there is a current spike on the 120V side of the transformer then that will cause a current spike on the 208V side of the transformer and immediately blow those fuses anyways. Is this just a certification thing where that redundancy is required? I’m in the US but this equipment does also get shipped to various overseas locations. Also, while it isn’t standard, this equipment is capable of passing a TUV inspection if a customer requests it so I’m not sure if the potentially redundant fuse is just a TUV requirement.
      """
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      My Electromagnetics is a bit rusty, apply a healthy measure of skepticism:\n
      \n
      I’d say the two fuses are there to protect the transformer itself.\n
      \n
      In the example you use, the upstream of the transformer would be protected by the 280V fuses but the transformer itself will have to suffer the overcurrent, and could be damaged by it. If the transformer is dipped in cooling oil, the overcurrent could even lead to an explosion.\n
      \n
      As for the TUV inspection, the two fuses would be desirable for any TUV cert, and they would be required if there is any chance of explosion.
      """
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    Definitely no chance of an explosion here. I’m not sure what the transformer is rated at off the top of my head but it is fused at 3A on the low voltage side and 2A on the high voltage side and I know it is rated for well over that. It’s a pretty beefy (5-10lb air cooled) transformer for the all of 0.5-1A it actually typically supplies on this machine.\n
    \n
    I am actually leaning towards TUV being the explanation though because your comment just reminded me that we actually got dinged by them before on a different piece of equipment because we didn’t have fuses on the DC side of a DC power supply despite the AC side having a fairly restrictive fuse directly upstream of that power supply which should have prevented any catostrophic failure on its own. I’m willing to bet the rules are the same for transformers.
    """
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