Siemens 3WA1120-3AB12-0AA0 3WA 4-Pole 2000A 66kA 690V Fixed Type Air Circuit Breaker ETU300 LSI

The Siemens 3WA1120-3AB12-0AA0 is a fixed-mounted, horizontally connected 4-pole air circuit breaker in the SENTRON 3WA series, rated at 2000 A continuous current with a rated breaking capacity (Icu) of 66 kA up to 500 V (50 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 2000 A and frame Size I, the 3WA1120-3AB12-0AA0 carries a class breaking capacity of 66 kA (Icu, up to 500 V). The fourth (neutral) pole is switched and protected with the phases, as required on TN-C-S and TT systems where the neutral must be isolated.

Fixed mounting removes the draw-out cradle and shutter mechanism, reducing panel depth and cubicle cost where the 2000 A breaker does not need to be withdrawn under a live bus. 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.