MCCB for line protection — 32 A, 3-pole, high interrupting capacity
The Siemens SENTRON 3VA1132-5EF32-0DC0 is a 3-pole molded case circuit breaker (MCCB) rated for 32 A continuous current (Iu) with a TM240 thermal-magnetic overcurrent release, purpose-built for line protection in distribution panels and industrial switchgear. Breaking capacity scales with system voltage: 187 kA at 240 V, 121 kA at 415 V, 75.6 kA at 440 V, and 17 kA at 690 V — meaning this breaker handles high-fault-current scenarios common in industrial mains or transformer secondary feeds without cascading upstream. Rated insulation voltage (Ui) is 800 V, so the breaker is suitable for 690 V line-to-line systems with margin.
Thermal derating and ambient temperature
The 32 A rating holds from 40 °C through 50 °C ambient; above that it derates linearly to 30.72 A at 55 °C, 30.08 A at 60 °C, 29.44 A at 65 °C, and 28.8 A at 70 °C. If the panel ambient runs hot, factor the derating into the load schedule. Operating range is -25 °C to +70 °C; storage range extends from -40 °C to +80 °C.
Auxiliary and undervoltage release configuration
This variant ships with an undervoltage release (UVR) as the auxiliary release design, and includes 2 auxiliary switches (HQ type) for status feedback to a PLC or annunciator panel. The integrated auxiliary trip module is order code 3VA9608-0BB25 — if you need a spare or replacement, that's the mate. No voltage trip, no communication function, no phase-failure detection, and no ground-fault monitoring on this version — it's a straight line-protection breaker with undervoltage release.
Panel fit and mounting
Dimensions are 76.2 mm wide, 130 mm tall, 70 mm deep — standard 3-pole MCCB footprint for a 32 A frame. Mounts on a DIN rail or direct panel via the SENTRON base; the IP40 front protection covers the operator face in a closed enclosure. No trip indicator on the front; status is read through the auxiliary switch contacts.