Siemens SENTRON auxiliary release, undervoltage release 24 V AC 50/60 Hz, 3 slots, 28.8 mm depth, 25.7 mm width, 65.1 mm height.
| Parameter | Value |
|---|---|
| Product designation | Accessories |
| Accessories | Auxiliary release |
| Parameter | Value |
|---|---|
| Width | 25.7 mm |
| Height | 65.1 mm |
| Depth | 28.8 mm |
| Parameter | Value |
|---|---|
| Number of slots | 3 |
| Stripped length | 10 mm |
| Degree of pollution | 3 |
| Overvoltage category | III |
| Stripped length [In] | 0.4 in |
| Design of the product | auxiliary release |
| Surge voltage resistance | 4 kV |
| Apparent power consumption (Maximum) | 2 VA |
| Type of electrical connection (For auxiliary circuit) | AWG18 / 750 mm |
The 3VA9978-0BB20: The 28.8 mm depth, 25.7 mm width, and 65.1 mm height match the accessory slot on the 3VA4/5/6 breaker body — it clips into the three-slot auxiliary bay on the side of the breaker. Overvoltage category III and a 4 kV surge voltage resistance mean this release is rated for the transient environment of a main distribution panel, not just a sub-panel.
No official successor exists because none is needed.
This is an undervoltage release accessory for Siemens SENTRON 3VA4, 3VA5, and 3VA6 molded-case circuit breakers. It trips the breaker when the control voltage (24 V AC) drops below the dropout threshold, providing undervoltage protection for downstream loads.
Depth is 28.8 mm, width is 25.7 mm, height is 65.1 mm — sized to fit the three-slot auxiliary bay on the side of the 3VA4/5/6 breaker.
Sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time.
No related articles