Siemens 3WA1240-4AB32-0AA0 3WA 3-Pole 4000A 85kA 690V Draw-out Type Air Circuit Breaker ETU300 LSI

The Siemens 3WA1240-4AB32-0AA0 is a draw-out-mounted, horizontally connected 3-pole air circuit breaker in the SENTRON 3WA series, rated at 4000 A continuous current with a rated breaking capacity (Icu) of 85 kA up to 500 V (66 kA at 690 V AC). It is supplied with the ETU300 LSI electronic trip unit and 2NO+2NC auxiliary contacts factory-fitted, dimensioned for main and sub-distribution switchgear operating up to 690 V.

Technical Specifications

Certifications & Standards

• IEC 60947-2

Selection Notes

At 4000 A and frame Size II, the 3WA1240-4AB32-0AA0 carries a class breaking capacity of 85 kA (Icu, up to 500 V). Three-pole switching covers the phase conductors for standard three-phase distribution.

The draw-out (withdrawable) design lets the 4000 A breaker be racked out to an isolated position for maintenance without de-energising the busbar, suiting incomer and tie positions where continuity of supply during service is required. The shutter assembly shrouds live primary contacts when withdrawn. The ETU300 LSI trip unit provides long-time (L), short-time (S) and instantaneous (I) protection with independent settings for time-current selectivity. The factory-fitted 2NO+2NC auxiliary contacts wire directly into PLC inputs for position and status signalling.