The Siemens 3VA1140-4EF36-0AG0 is a SENTRON molded case circuit breaker (MCCB) designed for line protection in distribution panels. Per the specification, it carries a 40 A rating at 40 °C ambient, with a 3-pole configuration and a TM240 thermal-magnetic overcurrent release. The breaking capacity reaches 121 kA at 240 V AC, 75.6 kA at 415 V AC, and 52.5 kA at 440 V AC — figures that govern its fault-interruption capability at each voltage level.
Rated Current and Thermal Derating
The 40 A rating holds from 40 °C through 50 °C, then derates to 39 A at 55 °C and 60 °C, 38 A at 65 °C, and 37 A at 70 °C. For audit purposes, the maximum operating temperature is 70 °C, with a storage range of -40 °C to 80 °C. The rated insulation voltage is 800 V, and maximum power loss is 10.8 W.
Breaking Capacity by Voltage
Breaking capacity is voltage-dependent: 121 kA at 240 V, 75.6 kA at 415 V, 52.5 kA at 440 V, and 11.9 kA at both 500 V and 690 V. These values determine the maximum fault current the breaker can safely interrupt at each system voltage, critical for selectivity coordination studies.
Physical Integration and Auxiliary Switching
Dimensions are 130 mm height, 76.2 mm width, and 70 mm depth. The breaker includes one auxiliary switch and one trip alarm switch (HP design). It does not include an undervoltage release, ground-fault monitoring, or communication function. The supplied basic switch order code is 3VA11404EF360AA0.