What it is and what the ratings mean for fit
The Siemens 3VA1050-2ED36-0JA0 is a SENTRON molded case circuit breaker (MCCB) built for line protection — the workhorse overcurrent and short-circuit device in a distribution panel. Its 50 A continuous rating at 40 °C holds flat through 50 °C, then derates to 45 A at 70 °C. That means in a hot enclosure with other breakers dumping heat, you still get the full 50 A up to 50 °C ambient; above that, the thermal curve kicks in and you lose a couple amps per 5 °C step. The 3-pole design handles three-phase circuits, and the TM210 overcurrent release gives a fixed thermal-magnetic trip — no field-adjustable dials, so selectivity is set at the factory. Breaking capacity climbs as voltage drops: 52.5 kA at 240 V, 32 kA at 415 V, 13.6 kA at 440 V, and 7.5 kA at both 500 V and 690 V. For a 415 V distribution board, the 32 kA figure gives solid headroom against most utility fault levels. The rated insulation voltage of 800 V means the internal clearances and creepage are specced for 690 V systems without derating the insulation path. Maximum power loss is 14.6 W — not negligible in a sealed panel; factor that into thermal calculations if you're stacking breakers tight.
Auxiliary release and panel integration
This variant ships with a shunt trip (STL) auxiliary release — the solenoid that lets a remote signal (e.g., from an E-stop or fire alarm relay) force the breaker open. No undervoltage release and no ground-fault monitoring on this order code; that's the baseline line-protection package. The supplied basic switch is 3VA10502ED360AA0, which is the internal switching mechanism. Panel footprint is 70 mm deep, 76.2 mm wide, 130 mm tall — standard 3-pole MCCB width for the SENTRON 3VA platform, so it lands in the same DIN-rail or mounting-plate slot as other 3VA frame sizes. No communication function and no trip indicator — this is a plain thermal-magnetic breaker with a remote-trip coil, not a metering or smart breaker.