What this MCCB is and what the ratings mean for fit
The Siemens 3VA1010-3ED42-0HA0 is a SENTRON molded case circuit breaker (MCCB) with four poles, rated 100 A at 40 °C, and a TM210 thermal-magnetic overcurrent release. The 100 A rating is the continuous current it carries at 40 °C ambient; above that temperature the current must be derated — at 55 °C it handles 98 A, at 60 °C it handles 96 A, and at 70 °C it handles 91 A. That derating curve matters if the breaker sits in a warm enclosure or near other heat sources. The breaking capacity is 75.6 kA at 240 V AC, 52.5 kA at 415 V, 32 kA at 440 V, and 7.5 kA at both 500 V and 690 V. The 75.6 kA figure at 240 V means it can safely interrupt a fault current of that magnitude at that voltage — critical for high-fault panels near large transformers or utility feeds. At 690 V the 7.5 kA rating is still substantial for most industrial loads. The breaker is designed for line protection — that is, it protects cables and busbars from overloads and short circuits, not motor or generator protection. The TM210 release is a thermal-magnetic type: the thermal element handles overloads (time-delayed), the magnetic element handles short circuits (instantaneous). The 210 designation means the magnetic trip threshold is 10× the rated current, so 1000 A for this 100 A frame.
Panel integration and mounting
The 3VA1010-3ED42-0HA0 mounts on a DIN rail or can be screw-fixed to a backplate. The dimensions are 130 mm high, 101.6 mm wide, and 70 mm deep — a 4-pole frame that fits standard 100 A MCCB panel cutouts. The 70 mm depth is the body depth; allow clearance for the shunt trip accessory and cable bending radius at the line and load terminals. The breaker includes a shunt trip (STL) auxiliary release for remote tripping — useful in emergency-stop or undervoltage protection schemes. There is no undervoltage release fitted as standard, and no communication function, so it is a standalone electromechanical device. The rated insulation voltage is 800 V, so it can be used in 690 V systems with adequate clearance. Maximum power loss is 25 W at rated current — factor that into enclosure thermal calculations if the panel is sealed or has limited ventilation.