Federal Pacific Electric USD-21 (LI) Solid-State Overcurrent Relay
The FPE FPE-USD-21-CUD-40 is a microprocessor-based USD-21 (LI) solid-state overcurrent relay providing LI protection for Class 2810 Type H-3 and HL-3 air circuit breakers. Rated for 1600-4000 current range with factory-calibrated thumbwheel switches for precise setting adjustment.
Protection Features
Provides LI overcurrent protection elements. USD-21 relay, LI protection, CUD-40 sensor compatible, thumbwheel calibration. Compatible with Compatible with 4000A frames. Plug-in mounting for easy field replacement and testing.
Applications
Replacement or upgrade overcurrent relay for FPE Class 2810 H-3/HL-3 air circuit breakers with CUD-40 sensors.
