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Siemens 3VA9908-0BB20 — Circuit Breaker Accessories

Siemens 3VA9908-0BB20 SENTRON Undervoltage Release, 24 V AC

MPN3VA9908-0BB20
Active

Siemens SENTRON 3VA9908-0BB20 undervoltage release accessory, 24 V AC 50/60 Hz, 2 VA, 4 kV surge, for 3VA1 and 3VA20 breakers.

$45.72Ref. price · indicative, final on quote
Siemens 3VA9908-0BB20 datasheet (PDF)
Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

3VA9908-0BB20 — Identification
ParameterValue
Product designationAccessories
AccessoriesAuxiliary release
3VA9908-0BB20 — Mechanical
ParameterValue
Width25.7 mm
Height65.1 mm
Depth28.8 mm
3VA9908-0BB20 — 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)2 VA

Product details

It is designed for the 3VA1 and 3VA20 molded-case breaker frames up to the 3VA25 size. The coil draws 2 VA at 50/60 Hz and is rated for a 4 kV surge withstand with overvoltage category III and pollution degree 3, meaning it is specified for the industrial panel environment where transient spikes and conductive dust are a given.

The release measures 25.7 mm wide by 65.1 mm tall by 28.8 mm deep — it snaps into one of the three accessory slots on the breaker's side. The terminals accept conductors stripped to 10 mm (0.4 in). No DIN-rail footprint of its own; it rides on the breaker body, so the panel layout does not change.

Frequently asked questions

What is the closest functional alternative to 3VA9908-0BB20?

The 5SY4140-7 is a SENTRON miniature circuit breaker, not an undervoltage release — it serves a different function (overcurrent protection). For an undervoltage release that fits the same 3VA breaker family, the 3VA9908-0BB20 is the correct order code; no direct functional second-source exists within the listed peers.

What are the key physical dimensions of 3VA9908-0BB20?

Width 25.7 mm, height 65.1 mm, depth 28.8 mm. It occupies one of the three accessory slots on the 3VA1/3VA20 breaker body.

Where can I buy 3VA9908-0BB20 and get current pricing?

This part is sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time — submit an RFQ for a firm commercial response.

What compliance documentation does Siemens provide for 3VA9908-0BB20?

The part carries SENTRON branding and is designed to IEC/EN standards for overvoltage category III and pollution degree 3. For specific RoHS, REACH, or UL documentation, request the manufacturer's declaration of conformity with your RFQ.

MPN
3VA9908-0BB20