Supplementary Protectors

Siemens' UL 1077 Supplementary Protectors are designed to provide additional protection along with a branch circuit protection device. Since our Supplementary protectors are made to trip faster than a standard UL 489 Circuit Breaker they are able to provide additional protection for more sensitive devices inside the panel. Supplementary protectors can used in a number of industrial applications such as to provide selectivity for multiple motor control circuits on the secondary side of a control transformer or power supply by allowing the user to quickly find the problem circuit should a fault occur with out having to shut down all of the other control circuits. Supplementary protectors may also be used as a local disconnecting means inside the panel when a branch circuit protection device is already present.

5SY Supplementary Protector Benefits

  • High rated breaking capacity of up to 14,000 A

  • Identical terminals at both sides for an optional infeed from the top or the bottom

  • No tool required for mounting or dismounting

  • Separate switch position indication

5SY4 - Supplementary Protectors (0.3 - 63A, AC)

5SP4 - Supplementary Protectors (80 - 125A, AC)

5SY5 - Supplementary Protectors (0.3 - 63A, AC/DC)


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