What this 3VA2 MCCB is and where it lands
The Siemens SENTRON 3VA2216-7JQ42-0DF0 is a 4-pole molded case circuit breaker (MCCB) designed for line protection in distribution panels. It carries a continuous current rating of 160 A across the full ambient range from 40 °C to 70 °C — no derating curve to chase in a warm enclosure. The adjustable overload trip range spans 1.5 A to 256 A, so you set the pickup to match the downstream load rather than swapping the breaker body. Breaking capacity hits 330 kA at 240 V and stays at 242 kA through 440 V, then drops to 187 kA at 500 V and 4.5 kA at 690 V — the high 240 V figure tells you this unit is built for high-fault utility feeds or transformer secondaries where available fault current is substantial.
What the ratings mean for fit
The 160 A continuous rating at 70 °C means this breaker handles full load in a hot panel without forced cooling — useful for a packed switchboard or a sunny outdoor enclosure. The 4-pole configuration (three phases plus neutral) suits three-phase four-wire systems where neutral protection is required, common in North American 120/208 V or 277/480 V wye distribution. The undervoltage release (UVR) lets a safety circuit or emergency-stop chain trip the breaker when control voltage drops, so it can serve as a shunt-trip for remote disconnect. Communication function is built in — the 3VA2 platform supports PROFIBUS or PROFINET via a plug-in module, so the breaker reports status and trips into a control system without hardwired aux contacts alone.
Dimensions and panel fit
The breaker measures 86 mm deep, 140 mm wide, and 181 mm tall. The 140 mm width is standard for a 4-pole MCCB in this frame size — it occupies the same footprint as other SENTRON 3VA2 4-pole units, so swapping between variants within the family doesn't require re-drilling the mounting plate or re-routing bus bars. Depth of 86 mm leaves room for rear-connected bus stabs or a cable entry gland behind the panel backplate.
Power loss and thermal management
Maximum power loss is 22.2 W at rated current. In a sealed enclosure with multiple breakers side by side, that heat adds up — account for it in the thermal budget if the panel is NEMA 12 or IP54 with no fan. The 70 °C operating maximum is the breaker's ambient limit, not the enclosure interior; keep internal air temperature below that threshold.