E-T-A

UL489 and UL1077 C1D2 Breaker Application

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Breaker Control Panel Application E - T - A Circuit Breakers Example of UL508A Control Panel Breaker Application 1. All main incoming breakers must be UL489 rated not back - fed with line and load reversed. The breaker must be sized to protect the wire. (1) Main Breaker UL489 Only (2) Branch Breaker UL489 Only (3) Branch Breaker UL489 Only (4) Supplementary Breaker UL1077 (5) Control Breaker UL1077 SMPS PDB PDB 5. UL1077 breakers can be applied to all control circuits. This applies to Thermal/Magnetic and Electronic UL1077 circuit protectors. 2. All branch circuits must be UL489 and not UL1077 rated. The breaker must be sized to protect the wire. 3. All branch circuits must be UL489 and not UL1077 rated. The breaker must be sized to protect the wire. 4. A branch circuit may have a UL1077 breaker applied where the upstream breaker is; UL489 rated Sized to protect the circuit wire The wire size between the two does not change A UL508 breaker may be used in circuits with motor applications.

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