What it is and what the interrupting rating means
The Siemens 3VA1180-6EF36-0HC0 is a SENTRON molded case circuit breaker (MCCB) designed for line protection in distribution panels. Its headline interrupting rating is 220 kA at 240 V — that's the maximum fault current it can safely clear without welding contacts or rupturing the case, which matters when you're coordinating downstream of a large transformer or feeding a high-fault bus. At 415 V it still handles 154 kA, and at 690 V it drops to 17 kA, so the available fault current at your secondary voltage is the spec that governs fit.
Current rating and thermal derating
Rated 80 A continuous at 40 °C ambient, and it holds that same 80 A all the way up to 50 °C — no derating needed in most ventilated enclosures. Above 50 °C it steps down: 78 A at 55 °C, 77 A at 60 °C, 75 A at 65 °C, 74 A at 70 °C. If your panel runs hot near the top of a gland plate, that 70 °C figure is the one to check against your load.
Physical fit and auxiliary options
Dimensions are 130 mm high by 76.2 mm wide by 70 mm deep — a 3-pole MCCB footprint that fits standard Siemens SENTRON panel mounting. It ships with a shunt trip release (STL) and two high-quality auxiliary switches, so you get remote trip capability and status feedback without adding separate modules. No undervoltage release, no ground-fault monitoring, no communication function on this variant.
Environmental range and approvals
Operates from -25 °C to 70 °C ambient, stores from -40 °C to 80 °C. Rated insulation voltage 800 V. Maximum power loss 19.2 W — a figure to account for in enclosure thermal calculations if you're packing several breakers in a small panel.