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Siemens 3VA9978-0BA23 — Circuit Breaker Accessories

Siemens SENTRON 3VA9978-0BA23 Shunt Trip, 208-277 V AC

MPN3VA9978-0BA23
Active

Siemens SENTRON, Shunt trip (auxiliary release), 3VA9978-0BA23, 208-277 V AC 50/60 Hz, 3 slots, 31.2 mm depth, 21.7 mm width, 65.1 mm height.

Siemens 3VA9978-0BA23 datasheet (PDF)
StockContact for availability
Lead timeIn Stock wk
MOQ1 pcs
Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Jul 2026
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Specifications

Identification

3VA9978-0BA23 — Identification
ParameterValue
Product designationAccessories
AccessoriesAuxiliary release

Mechanical

3VA9978-0BA23 — Mechanical
ParameterValue
Width21.7 mm
Height65.1 mm
Depth31.2 mm

Other specifications

3VA9978-0BA23 — Other specifications
ParameterValue
Number of slots3
Product versionAuxiliary release
Stripped length10 mm
Degree of pollution3
Overvoltage categoryIII
Stripped length [In]0.4 in
Surge voltage resistance4 kV
Apparent power consumption (Maximum)720 V·A

Product details

The Siemens SENTRON 3VA9978-0BA23 is a shunt trip — an auxiliary release that remotely trips a circuit breaker when voltage is applied. It's designed for the 3VA4 and 3VA5 (frames 1-4) and 3VA6 (frames 1-4) molded-case breakers. That's a healthy coil; make sure your control transformer can handle the surge.

Mechanically, this accessory snaps into the three designated slots on the breaker's side. Physical footprint is 31.2 mm deep, 21.7 mm wide, and 65.1 mm tall — it doesn't add width to the breaker's DIN-rail envelope, but it does project slightly beyond the breaker face. The terminals accept conductors with a 10 mm strip length.

Frequently asked questions

Where can I buy 3VA9978-0BA23 and get a price?

We source this part through independent distribution and quote it to order against an RFQ. Submit an RFQ for current availability and pricing.

What is the apparent power consumption of this shunt trip?

Maximum apparent power consumption is 720 VA. That's the inrush figure; steady-state draw is lower, but the control transformer must be sized for the peak.

What breakers does 3VA9978-0BA23 fit?

It fits the SENTRON 3VA4, 3VA5 (frames 1-4), and 3VA6 (frames 1-4) molded-case breakers. It occupies three accessory slots on the side of the breaker.

MPN
3VA9978-0BA23