What this MCCB is and what it does
The Siemens 3VA2110-5MN36-0JL0 is a SENTRON molded case circuit breaker (MCCB) in a motor protection configuration, with an ETU350M electronic overcurrent release and an integrated shunt trip (STL). Three poles, rated continuous current Iu of 100 A, and a rated insulation voltage Ui of 800 V. The ETU350M release provides adjustable overload and short-circuit protection plus phase failure detection — that last one is critical for three-phase motor circuits where a lost phase can single-phase a motor and burn the winding before a standard thermal-magnetic breaker catches it. The shunt trip lets a remote safety relay or PLC force the breaker open on demand, which is clean for emergency-stop chains or undervoltage protection schemes.
Breaking capacity — what the numbers mean for your fault duty
This MCCB carries a 187 kA interrupting rating at 240 V AC, 121 kA at 415/440 V, 75.6 kA at 500 V, and 17 kA at 690 V. These are the maximum fault currents the breaker can safely interrupt at each voltage level — if the available fault current at the panel exceeds the rating at your system voltage, you need a current-limiting upstream device or a higher-rated breaker. The 187 kA at 240 V covers high-fault industrial distribution, common in transformer-secondaries or large motor control centers. At 690 V the 17 kA rating still handles most standard motor branch circuits, but verify against the transformer and cable impedance on your line.
Thermal derating — don't trust the 100 A at 40 °C if your panel runs hot
Rated continuous current is 100 A up to 50 °C ambient. At 55 °C it derates to 96 A, at 60 °C to 94 A, at 65 °C to 92 A, and at 70 °C to 90 A. If your enclosure is packed tight or near a heat source, the 100 A nameplate only holds below 50 °C. The maximum operating ambient is 70 °C; storage range is -40 to 80 °C. Power loss at full load is 75 W max — factor that into your enclosure thermal calculation, especially with multiple breakers ganged together.
Auxiliary contacts and trip indication
Comes with 2 auxiliary switches, 1 trip alarm switch, and 1 electrical alarm switch (HQ configuration). The trip indicator and voltage trigger are present. That trip alarm switch signals a fault trip separately from the auxiliary — useful for remote annunciation in a PLC or SCADA system. The electrical alarm switch reports the breaker's open/closed status, so you can distinguish a manual open from a protection trip without a separate monitoring relay.
Mechanical endurance and mounting
Rated for 20 000 mechanical operations (latching endurance). Dimensions: 86 mm deep, 105 mm wide, 181 mm high. Mounts on a DIN rail or directly to a panel backplate via the standard MCCB footprint. The 105 mm width is a 3-pole frame size — verify panel cutout and busbar spacing against your existing layout before ordering.