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3VA9978-0BL33
Siemens 3VA9978-0BL33 available at EU Automation. Get in touch today for a quick price.
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What happens next?
1. Email confirmation
You will get an email confirming that we have received your enquiry.
2. Dedicated Account Manager
One of our team will be in touch to confirm your part(s) specification and condition.
3. Your quote
You will receive a comprehensive quote tailored to your specific needs.
Siemens 3VA9978-0BL33 is a SENTRON shunt trip left auxiliary release designed as an accessory for Siemens 3VA4, 3VA5 and 3VA6 moulded case circuit breakers. It enables remote electrical tripping of compatible breakers when the appropriate control voltage is applied, supporting integration into control panels, distribution systems and industrial electrical installations.
This shunt trip operates with a control supply voltage of 208–277 V AC at 50/60 Hz or 220–250 V DC. It has a maximum apparent power consumption of 40 VA and a maximum DC active power consumption of 35 W. The unit features a rated insulation voltage of 690 V, surge voltage resistance of 4 kV, pollution degree 3 and overvoltage category III.
Compact in design, the 3VA9978-0BL33 measures 65.1 mm high, 25.7 mm wide and 31.2 mm deep, with a net weight of approximately 91 g. It uses screw-type terminals with a tightening torque range of 0.4–0.5 N·m, a 10 mm stripping length and conductor compatibility from 0.5 mm² to 1.5 mm², equivalent to AWG 20–16. Its left-side mounting format makes it suitable for adding remote trip functionality to compatible SENTRON breaker assemblies where precise electrical release operation is required.
This shunt trip operates with a control supply voltage of 208–277 V AC at 50/60 Hz or 220–250 V DC. It has a maximum apparent power consumption of 40 VA and a maximum DC active power consumption of 35 W. The unit features a rated insulation voltage of 690 V, surge voltage resistance of 4 kV, pollution degree 3 and overvoltage category III.
Compact in design, the 3VA9978-0BL33 measures 65.1 mm high, 25.7 mm wide and 31.2 mm deep, with a net weight of approximately 91 g. It uses screw-type terminals with a tightening torque range of 0.4–0.5 N·m, a 10 mm stripping length and conductor compatibility from 0.5 mm² to 1.5 mm², equivalent to AWG 20–16. Its left-side mounting format makes it suitable for adding remote trip functionality to compatible SENTRON breaker assemblies where precise electrical release operation is required.
| Specification | Description |
|---|---|
| Manufacturer | Siemens |
| Part Number | 3VA9978-0BL33 |
| Alternative Part Number | 3VA99780BL33 |
| Product Range | SENTRON |
| Product Type | Shunt trip accessory |
| Product Design | Left-mounted auxiliary release, STL |
| Compatible Breaker Series | Designed for use with Siemens 3VA4, 3VA5 and 3VA6 moulded case circuit breakers |
| AC Control Supply Voltage | 208 to 277 V AC |
| AC Frequency | 50/60 Hz |
| DC Control Supply Voltage | 220 to 250 V DC |
| Maximum Apparent Power Consumption | 40 VA |
| Maximum DC Active Power Consumption | 35 W |
| Rated Insulation Voltage | 690 V |
| Surge Voltage Resistance | 4 kV |
| Overvoltage Category | Category III |
| Degree of Pollution | 3 |
| Number of Slots | 3 |
| Height | 65.1 mm |
| Width | 25.7 mm |
| Depth | 31.2 mm |
| Net Weight | 91 g |
| Terminal Type | Screw-type terminals |
| Tightening Torque | 0.4 to 0.5 N·m |
| IEC Wire Stripping Length | 10 mm |
| Connectable Conductor Cross-Section | 0.5 to 1.5 mm² |
| AWG Conductor Range | AWG 20 to AWG 16 |
| UL Wire Stripping Length | 0.4 in |
| UL Tightening Torque | 3.5 to 4.4 lbf·in |
| Typical Application | Provides remote electrical tripping capability for compatible Siemens 3VA circuit breakers in control panels and low-voltage distribution assemblies |
What type of electrical accessory is this?
This is a left-side shunt trip accessory for Siemens SENTRON 3VA moulded case circuit breakers. It is used to trip a compatible breaker electrically from a remote control signal.
What is a shunt trip used for?
A shunt trip is used to open a circuit breaker when an external voltage is applied to the trip coil. Common uses include remote disconnection, emergency-off circuits, interlocking arrangements and automated panel control.
Which breaker ranges is it designed for?
It is intended as an accessory for Siemens 3VA4, 3VA5 and 3VA6 moulded case circuit breakers, subject to the correct frame size and accessory mounting position.
What does the left-side designation mean?
The left-side designation indicates that the accessory is fitted in the left-hand accessory location of the compatible breaker. The mounting position should be checked against the breaker configuration before installation.
What control voltage does it use?
This shunt trip is rated for 208 to 277 V AC at 50/60 Hz, and 220 to 250 V DC. For 3VA9978-0BL33, the maximum apparent power consumption is 40 VA and the maximum DC active power consumption is 35 W.
Can it be used on both AC and DC control circuits?
Yes. The accessory is suitable for the specified AC and DC control voltage ranges: 208 to 277 V AC at 50/60 Hz, or 220 to 250 V DC.
What are the main dimensions?
The unit measures approximately 65.1 mm high, 25.7 mm wide and 31.2 mm deep. Its net weight is approximately 91 g.
What wiring size can be connected?
For IEC wiring, the connectable conductor cross-section is 0.5 to 1.5 mm². The coded AWG range for auxiliary contacts is AWG 20 to AWG 16.
What stripped conductor length is required?
The specified stripped conductor length is 10 mm, equivalent to 0.4 in.
What terminal tightening torque should be used?
For screw-type terminals, the tightening torque range is 0.4 to 0.5 N·m. In imperial units, this is 3.5 to 4.4 lbf·in.
What insulation and surge ratings does it have?
The rated insulation voltage is 690 V, with a surge voltage resistance of 4 kV. It is also listed with overvoltage category III and pollution degree 3.
Is it a main breaker or an accessory?
It is an auxiliary release accessory, not a standalone circuit breaker. It must be installed into a compatible Siemens 3VA breaker to perform its intended tripping function.
- Remote tripping of compatible Siemens 3VA4, 3VA5 and 3VA6 moulded case circuit breakers
- Integration into control panels where breaker opening is required from an external command signal
- Use in industrial distribution boards for controlled disconnection of electrical circuits
- Panel upgrades requiring a left-mounted shunt trip accessory for Siemens SENTRON 3VA breakers
- Motor control centre applications where circuit breakers need to be released from a separate control circuit
- Building services switchgear where remote breaker operation is required
- Automation systems that need electrical actuation of a circuit breaker trip mechanism
- Electrical isolation arrangements using 208–277 V AC or 220–250 V DC control supplies
- Replacement of existing Siemens 3VA9978-0BL33 shunt trip modules in compatible installations
- OEM machinery panels using Siemens 3VA breaker accessories for controlled circuit interruption
This content has been produced using multiple sources. EU Automation takes no responsibility for the accuracy of this information. Always consult the original equipment manufacturer for the most up to date instructions and information.
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Customer reviews
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Tom Higgins did a great job at getting us the part we needed. He saw a concern with the part a verified before shipping.
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6 months ago
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