MCCB for line protection – 4-pole, 32 A, TM220 release
The Siemens 3VA1132-5EE46-0AA0 is a SENTRON molded case circuit breaker designed for line protection in distribution panels. It is a 4-pole unit rated 32 A at 40 °C, fitted with a TM220 thermal-magnetic overcurrent release. The interrupting capacity reaches 187 kA at 240 V AC and 121 kA at 415 V AC, giving it the headroom to clear high-fault currents without upstream coordination issues. Rated insulation voltage is 800 V, and the front face carries IP40 protection — suitable for enclosed panel mounting where dust ingress is controlled. The breaker draws 10.6 W maximum power loss at rated load, a figure to factor into panel thermal calculations.
Thermal derating and operating range
The 32 A rating holds steady from 40 °C through 50 °C. At 55 °C it derates to 31 A, and at 70 °C to 30 A. Operating ambient spans -25 °C to 70 °C; storage range is -40 °C to 80 °C. The TM220 release is a fixed thermal-magnetic type — no interchangeable trip units, so the breaker is specified for a single current setting.
Physical fit and panel integration
Dimensions are 130 mm height, 101.6 mm width, 70 mm depth. The 4-pole footprint matches standard SENTRON 3VA panel cutouts and busbar layouts. No undervoltage release, no trip indicator, no communication function — a straightforward line-protection breaker with no auxiliary electronics to wire.