What this MCCB carries and where it fits
The Siemens 3VA2163-5JP32-0JL0 is a 3-pole SENTRON molded case circuit breaker rated for 63 A continuous current (Iu) at up to 40 °C, with the ETU550 electronic trip unit handling the overcurrent protection. It's built for line protection — meaning it sits at the feeder or main distribution point, not as a motor-protective device. The 187 kA breaking capacity at 240 V AC tells you this breaker can interrupt a very high fault current without welding its contacts or venting plasma into the panel; at 415 V and 440 V it still holds 121 kA. That kind of interrupting rating is what you need for a transformer-fed main or a high-capacity bus riser where the available fault current is well above what a standard 25 kA or 36 kA MCCB could handle. The ETU550 electronic trip unit gives you adjustable long-time, short-time, instantaneous, and ground-fault protection curves — it's not a fixed thermal-magnetic breaker. That means you can coordinate it downstream with smaller MCCBs or fused switches and upstream with a main breaker or transformer secondary protection. The auxiliary contact configuration (2 auxiliary switches + 1 trip alarm + 1 electrical alarm) lets you send status and trip signals back to a PLC or annunciator panel without adding external relays.
Breaking capacity across the voltage range — what the numbers mean
At 240 V the breaker is rated for 187 kA; at 415 V and 440 V it drops to 121 kA; at 500 V it's 79 kA; and at 690 V it's 4.25 kA. The steep drop at 690 V is typical for an IEC-rated MCCB — the arc extinction gets harder as voltage rises, so the same contact geometry can't interrupt as much current. For a 690 V installation (some industrial systems or mining applications), you'd need to verify the available fault current is under 4.25 kA, or step up to a higher-rated frame. For most 400 V distribution panels, 121 kA is well above what you'll see on a transformer secondary, so you've got headroom for selectivity.
Panel fit and dimensions
The breaker measures 86 mm deep × 105 mm wide × 181 mm high. It mounts on a DIN rail or can be screw-mounted to a backplate.
Auxiliary and trip options built in
This variant includes a shunt trip (STL) release for remote tripping — useful for emergency-stop circuits or supervisory shutdown. The auxiliary contact set gives you two form-C auxiliary switches, one trip alarm switch (flags when the breaker trips on fault), and one electrical alarm switch (flags when the breaker is open for any reason). The undervoltage release is not fitted, so if you need UVR for undervoltage protection you'd need a different variant or an add-on module. Phase failure detection is also absent; the ETU550 handles phase loss through its long-time curve but doesn't have a dedicated phase-failure element.
Thermal derating and ambient limits
The breaker carries 63 A continuously up to 50 °C without derating. Above that, it steps down: 60.6375 A at 55 °C, 58.275 A at 60 °C, 55.9125 A at 65 °C, and 53.55 A at 70 °C (–). The operating ambient range is -25 °C to 70 °C; storage range is -40 °C to 80 °C. If the breaker lives inside a hot enclosure — say next to a transformer or in a non-ventilated panel — you'll need to apply that derating or upsize the frame. The 4 W maximum power loss is low enough that heat buildup from the breaker itself is minimal; the derating is driven by the ambient, not self-heating.