Siemens Sentron for use with 3VA Series Circuit Breaker

The auxiliary and alarm switches for 3VA molded case circuit breakers can be installed in all sizes of all breakers up to 630 A.
All auxiliary and alarm switches are designed as changeover contacts and therefore provide a high degree of flexibility for planning and installation purposes

Auxiliary switches signal the position of the main contacts of the molded case circuit breaker (RS 874-4534 and 874-4537)
Trip alarm switches signal every circuit breaker trip, regardless of the cause of the trip (RS 874-4512 and 874-4515)
Electrical alarm switches are operated as soon as the main contacts of the molded case circuit breaker open in the event that the breaker is tripped by the ETU (RS 874-4519)
Short circuit alarm switches signal trips only if they have been initiated by a short circuit (RS 874-4528)

Undervoltage releases trip the molded case circuit breaker in the event that the rated voltage fails or drops to between 70 % and 35 % of its normal value (in compliance with the relevant standard)
The units are available with rated voltages in the following range:

230 VAC (RS 874-4525)
24 VDC (RS 874-4521)

Shunt trips of type STL can be fitted in the left-hand accessories compartment as an alternative to an undervoltage release. The units are available with five rated voltages in the following range:

230 VAC (RS 874-4540)
24 VAC/VDC (RS 874-4531)

This shunt trip is a vital accessory designed for the 3VA series circuit breaker. Featuring a compact design with dimensions of 65.1mm in height, 25.7mm in width, and 31.2mm in depth, it operates at dual voltage levels of 208-277 V AC and 220-250 V DC. The model is specifically engineered to enhance electrical safety devices within automation and industrial environments.

• Operates efficiently at 50/60 Hz frequency with low power consumption
• Designed for robust performance with pollution degree rating of 3
• Offers surge voltage resistance of 4kV for added safety
• Features easy connections compatible with various conductor sizes
• Lightweight at 91g for uncomplicated installation and handling

• Utilised in conjunction with 3VA1 and 3VA20-26 circuit breakers
• Suitable for enhancing safety measures in industrial environments
• Effective in automation systems requiring rapid circuit interruption
• Ideal for use in environments subject to electrical disturbances

It operates effectively with voltage ratings of 208-277 V AC and 220-250 V DC across a frequency range of 50/60 Hz. It is critical to ensure that these ratings match your system requirements for optimal performance.

Adjusting the tightening torque between 0.4 N·m and 0.5 N·m for screw-type terminals ensures secure connections, significantly reducing the risk of electrical faults due to loose fittings.

This model has a compact design with a height of 65.1mm, width of 25.7mm, and depth of 31.2mm, providing an efficient fit in tight spaces while maintaining necessary functionality.

Siemens 3VA MCCBs and accessories