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Siemens 3VA9978-0BA25 — Circuit Breaker Accessories

Siemens SENTRON 3VA9978-0BA25 Shunt Trip, 600 V AC, 300 VA

MPN3VA9978-0BA25
Active

Siemens SENTRON auxiliary release / shunt trip, 600 V AC 50/60 Hz, 300 VA coil, 4 kV surge voltage resistance, 31.2 mm depth, for 3VA4 and 3VA5/3VA6 breakers.

Siemens 3VA9978-0BA25 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

3VA9978-0BA25 — Identification
ParameterValue
Product designationAccessories
AccessoriesAuxiliary release

Mechanical

3VA9978-0BA25 — Mechanical
ParameterValue
Width21.7 mm
Height65.1 mm
Depth31.2 mm

Other specifications

3VA9978-0BA25 — Other specifications
ParameterValue
Number of slots3
Stripped length10 mm
Degree of pollution3
Overvoltage categoryIII
Stripped length [In]0.4 in
Design of the productauxiliary release
Surge voltage resistance4 kV
Apparent power consumption (Maximum)300 VA

Product details

Shunt trip for 3VA molded-case breakers

The Siemens SENTRON 3VA9978-0BA25 is a shunt trip (auxiliary release) designed for the 3VA4, 3VA51–3VA54, and 3VA61–3VA64 molded-case circuit breaker families. It provides remote tripping via a 600 V AC control signal at 50/60 Hz, drawing up to 300 VA apparent power at the coil. Dimensions are 31.2 mm deep × 21.7 mm wide × 65.1 mm tall — it clips into the breaker's accessory slot without increasing the panel cutout.

Integration into the breaker

The shunt trip occupies one of the three accessory slots on 3VA4/3VA5/3VA6 frames. Strip length for the control wiring is 10 mm (0.4 in). The 21.7 mm width allows side-by-side mounting of multiple accessories in the same breaker. No DIN-rail or panel cutout change is needed — it installs entirely within the breaker's existing envelope.

Frequently asked questions

Where can I buy 3VA9978-0BA25 and how is it quoted?

The part is sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time.

What is the closest functional second-source to 3VA9978-0BA25?

The 5SY4140-7 is a SENTRON miniature circuit breaker, not a shunt trip accessory — it is not a functional equivalent. The 3VA9978-0BA25 is specific to 3VA molded-case frames and has no direct second-source from the 5SY series.

What compliance documentation does Siemens provide for this shunt trip?

The SENTRON brand typically provides CE, UL, and CSA declarations for the 3VA accessory line. Specific certification markings are confirmed at order; RoHS and REACH compliance documentation is available on request.

MPN
3VA9978-0BA25