Siemens SENTRON 3VA1140-5EF32-0AG0 — 40 A MCCB with TM240 Release
The Siemens SENTRON 3VA1140-5EF32-0AG0 is a 3-pole molded case circuit breaker (MCCB) rated for line protection, with a continuous current of 40 A at 40 °C and a TM240 thermal-magnetic overcurrent release. Its interrupting capacity reaches 187 kA at 240 VAC, 121 kA at 415 VAC, and 75.6 kA at 440 VAC — figures that govern selectivity and SCCR coordination in high-fault panels.
Interrupting Capacity and Selectivity Coordination
At 240 V the breaker clears 187 kA; at 415 V it clears 121 kA; at 440 V it clears 75.6 kA; at 500 V and 690 V it clears 17 kA. These are the values an electrical engineer uses to verify upstream breaker coordination and downstream SCCR compliance per IEC 60947-2. The TM240 release provides thermal-magnetic protection with a fixed thermal pickup at 40 A and a magnetic trip threshold set at 240 A (6× In).
At 55 °C it derates to 39 A, at 65 °C to 38 A, and at 70 °C to 37 A. Maximum power loss is 10.8 W. These derating curves matter when the breaker is mounted in a sealed enclosure or alongside heat-generating components.
Width is 76.2 mm (3 in), height 130 mm (5.12 in), depth 70 mm (2.76 in). The 3-pole footprint matches the standard SENTRON 3VA mounting pattern; it installs on a DIN rail or via screw-mount to a backplate. The auxiliary switch configuration (1 aux + 1 trip alarm, HP) is factory-integrated — no separate add-on module required.