IEC frame 160 MCCB with TM220 trip — 32 A, 36 kA @ 415 V
The Siemens 3VA1132-4GE42-0AA0-ZD00 is a 4-pole molded-case circuit breaker on the IEC frame 160 platform, rated In = 32 A with a TM220 thermal-magnetic trip unit. The overload setting Ir is adjustable from 22 A to 32 A, and the short-circuit pickup Ii is fixed at 10 × In (320 A). The N-conductor is protected at 100 %, meaning the neutral pole trips with the phase poles, not at a reduced setting. A nut keeper kit is included for DC Power OEM builds in China; that kit secures the breaker terminals against vibration in transport or high-duty cycling.