Siemens 3VA1150-4EF36-0CH0 SENTRON MCCB – 50 A, 3-Pole, 121 kA Breaking Capacity
The Siemens 3VA1150-4EF36-0CH0 is a SENTRON molded case circuit breaker (MCCB) rated for line protection, sized at 50 A continuous current at 40 °C and carrying a 3-pole configuration. Its interrupting capacity hits 121 kA at 240 V and 75.6 kA at 415 V — numbers that matter when you're clearing high-fault faults downstream of a transformer or feeding a motor control center. That 50 A rating holds steady through 50 °C, then derates to 48 A at 55 °C, 47 A at 60 °C, 46 A at 65 °C, and 45 A at 70 °C — so if your panel runs hot near the top of the enclosure, you lose about 1 A per 5 °C above 50 °C. Plan your load margin accordingly.
Key Ratings & What They Mean
Rated insulation voltage Ui of 800 V — that's the maximum voltage the internal insulation can withstand continuously. The TM240 overcurrent release is a thermal-magnetic trip unit — thermal for overload protection (adjustable), magnetic for short-circuit. No electronic adjustment, no communication, no ground-fault monitoring on this variant. Comes with an undervoltage release (UVR) as standard — if the control voltage drops, the breaker trips. That's useful for safety circuits or coordinated shutdown sequences. The auxiliary contact version is 2 auxiliary switches plus 1 trip alarm switch (HQ type), giving you status feedback for PLC or annunciator inputs.
Physical Fit & Panel Integration
Dimensions: 130 mm high, 76.2 mm wide, 70 mm deep. That's a standard 3-pole MCCB footprint — fits most DIN-rail or panel-mount enclosures without surprises. Front face carries IP40 protection, so it's fine for a clean indoor panel but not washdown areas.