Siemens SENTRON 3VA1010-3ED42-0DC0 — 100 A MCCB with Undervoltage Release
The Siemens 3VA1010-3ED42-0DC0 is a 4-pole molded case circuit breaker from the SENTRON series, designed for line protection. It carries a continuous rating of 100 A at 40 °C, with thermal derating to 91 A at 70 °C. The interrupting capacity reaches 75.6 kA at 240 V, stepping down to 52.5 kA at 415 V and 32 kA at 440 V — figures that govern its fault-clearing capability in a distribution panel. An integrated undervoltage release (UVR) trips the breaker when supply voltage drops below a set threshold, which is a common requirement for motor feeder circuits where loss-of-voltage protection prevents automatic restart.
Current Rating and Thermal Behavior
The 100 A rating holds steady from 40 °C through 50 °C, then derates linearly: 98 A at 55 °C, 96 A at 60 °C, 94 A at 65 °C, and 91 A at 70 °C. For a panel that runs warm — say, 55 °C ambient inside the enclosure — the usable current drops to 98 A. That 2 A difference matters when the breaker is feeding a continuous load near its nameplate; the thermal curve is the real limit, not the 100 A sticker.
Interrupting Capacity Across Voltages
The 75.6 kA at 240 V is the highest short-circuit rating on this breaker. At 415 V — common in European industrial panels — it still clears 52.5 kA. At 440 V it drops to 32 kA, and at 500 V and 690 V it holds at 7.5 kA. The insulation voltage is rated 800 V, so the breaker is physically built for 690 V systems, but the fault current it can interrupt at that voltage is limited to 7.5 kA. Selectivity studies should use the voltage-specific value, not the headline number.
Auxiliary and Release Configuration
This variant ships with two auxiliary switches (HQ type) and an undervoltage release. The UVR is wired into the control circuit; when voltage falls below its dropout threshold, it mechanically trips the breaker. That is a standard safety interlock for conveyors, pumps, or any load where unexpected restart after a brownout is hazardous. The auxiliary switches provide status feedback — open/closed — to a PLC or indication lamp. No communication function or ground-fault monitoring is built in; this is a plain line-protection breaker with a UVR add-on.
Physical Fit and Panel Integration
Dimensions are 130 mm height, 101.6 mm width, and 70 mm depth. The 70 mm depth is the front-to-back projection behind the panel door — relevant when the enclosure depth is tight or when busbar connections run behind the breaker. The 101.6 mm width (4 inches) is the standard footprint for a 4-pole SENTRON 3VA1 frame; it occupies four 25.4 mm module positions on a DIN rail or mounting plate. No trip indicator is fitted, so a visual check of the handle position is the only local status cue.