160 A, 4-pole, 121 kA — what the ratings mean for your panel
The Siemens 3VA1116-4FF46-0AA0 is a SENTRON molded case circuit breaker rated 160 A continuous current (Iu) at 40 °C, with a TM240 thermal-magnetic overcurrent release. Four poles handle three-phase plus neutral, with N-conductor protection set at 50% of the phase rating. The interrupting capacity hits 121 kA at 240 V and 76 kA at 415 V — enough for high-fault utility feeds or transformer secondaries where a standard MCCB would cascade. At 690 V it still breaks 11.9 kA, so it covers 480Y/277 V and 600 V delta services without a current-limiting fuse ahead of it. That 160 A holds flat from 40 °C through 50 °C, then derates to 158 A at 55 °C and 150 A at 70 °C — typical for a panel near a furnace or in a hot-climate enclosure where ambient hits 60 °C. The TM240 release means the thermal element is calibrated for a 240 A frame with a 160 A continuous rating; the magnetic pickup trips on short-circuit, not overload. Insulation voltage is 800 V, and the front face carries IP40 — fine for a closed panel, not for washdown. Maximum power loss is 38 W at rated load, which matters when you're sizing ventilation or calculating heat rise in a sealed enclosure. Mechanical endurance is 20,000 operations — not a frequent-switching device; this is a feeder or main breaker, not a motor-starting contactor.
Panel fit and integration
Mounts on a standard DIN rail or direct-panel mount. Dimensions: 130 mm high, 101.6 mm wide, 70 mm deep — the 4-pole width is about 4 inches, so it occupies four 1-inch module spaces on the rail. The 70 mm depth (2.8 in) clears most standard enclosures; verify clearance for the handle throw and arc-chamber venting at the top. Operating temperature range is -40 °C to 70 °C, storage -40 °C to 80 °C.
Coordination and selectivity note
The 121 kA at 240 V and 76 kA at 415 V ratings give headroom for selective coordination with downstream branch breakers. The TM240 release's thermal curve is fixed; no electronic adjustment or communication module on this variant. For DC networks, the 3VA device manual covers switching power values — this unit is rated for 600 V DC maximum operational voltage.