What this MCCB is and where it fits
The Siemens 3VA1180-4EF36-0AC0 is a SENTRON molded case circuit breaker (MCCB) rated for line protection, meaning it sits at the feeder or branch level in a distribution panel to protect cables and busbars from overloads and short circuits. It carries a continuous current of 80 A at 40 °C (derated to 74 A at 70 °C) and breaks up to 121 kA at 240 V AC — enough for high-fault utility connections or transformer secondaries. The TM240 thermal-magnetic release gives a fixed thermal pickup and magnetic trip threshold, so no adjustment dials to set; it's a fit-and-forget part for standard distribution duty.
Breaking capacity — what the numbers mean
The interrupting rating varies by system voltage: 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. At 240 V this breaker handles the highest fault currents found in North American commercial services; at 690 V it still clears 11.9 kA, which covers most European industrial motor circuits. The insulation voltage is rated 800 V, so the breaker is safe for 690 V systems with margin. Power loss runs 19.2 W at full load — negligible for panel thermal budgeting.
Mounting and integration
Three-pole construction, 76.2 mm wide (3 in), 130 mm tall, 70 mm deep. It mounts on a DIN rail or directly to a panel backplate via the screw terminals. The breaker ships without a trip indicator or undervoltage release, and has no communication module — it's a plain thermal-magnetic MCCB for hardwired distribution. Two auxiliary switches (HQ type) are built in for status feedback to a PLC or annunciator. Operating temperature range is -25 °C to 70 °C; storage from -40 °C to 80 °C.