What this MCCB delivers on the line side
The Siemens SENTRON 3VA2116-5HN32-0DH0 is a 3-pole molded case circuit breaker rated for 160 A continuous current at up to 70 °C ambient — no derating needed across the full operating temperature band. That 160 A holds at every point from 40 °C through 70 °C, so it nails the cure recipe in a hot press room without a temperature-compensation table. Breaking capacity is 187 kA at 240 V, 121 kA at 415 V and 440 V, 75.6 kA at 500 V, and 3.7 kA at 690 V. That gives real selectivity headroom downstream — the 121 kA at 415 V means it can ride through a bolted fault on a 2 MVA transformer secondary without upstream coordination issues.
Line protection with undervoltage release
This variant is configured for line protection (not motor or generator protection) and includes an undervoltage release (UVR) as the auxiliary release. The UVR trips the breaker when supply voltage drops below a set threshold — useful for preventing automatic restart after a brownout on a curing press line. The auxiliary switch block carries 2 auxiliary switches plus 1 trip alarm switch (HQ), giving status feedback for both open/closed and fault-trip conditions. The supplied basic switch is order code 3VA21165HN320AA0, which means the internal switching mechanism is a known, replaceable subassembly. No communication function or ground-fault monitoring on this variant — it is a straight thermal-magnetic line protection breaker with the UVR add-on.
Physical fit and panel integration
Dimensions are 105 mm wide, 181 mm high, and 86 mm deep — a standard SENTRON 3VA frame size that mounts on a DIN rail or directly to a backplate. The 86 mm depth leaves room for rear-connected busbars in a typical MCC bucket. Power loss at rated current is 28 W maximum, so ventilation in a sealed enclosure is advisable if multiple breakers are ganged.