Differential Relay Centre Type A Ultra-immune Circutor CBS-40A

The Circuitor CBS-40A type A differential relay centre, reference P12A70, is a device designed to provide robust and efficient differential protection in electrical installations. This 3-module device is specially designed to ensure electrical safety by controlling up to four differential protection networks simultaneously, offering high immunity to high-frequency currents and ensuring a quick and effective response to potential electrical faults.

Functionality and Main Features

The CBS-40A is equipped with four independent programmable relays, allowing the control of up to four external toroidal transformers from the WGC/WGS series, making it an integral solution for differential protection in medium to large-scale installations. Additionally, the device incorporates a pre-alarm relay to warn of potential events before a trip occurs, providing an additional layer of safety.

One of the most notable aspects of this device is its super immunised type A relay, which can filter high-frequency currents, making it highly resistant to electrical disturbances and providing accurate true RMS (TRMS) measurement. This feature ensures that interferences in electrical networks do not affect the operation of differential protections, which is essential for critical installations.

Adjustable Sensitivity and Delay

The sensitivity range of the CBS-40A is wide, adjustable from 0.03 A to 30 A, allowing the device to be adapted to different types of installations and protection needs. Furthermore, the delay time is fully configurable, from 0.1 to 5 seconds in various options, facilitating its customisation to suit the particular characteristics of each electrical network. These adjustments allow the device to act precisely, avoiding untimely trips that could unnecessarily interrupt the power supply.

Interface and Control

The device features a negative LCD display and two LED indicators, which provide real-time information on the status of protections and connections. Additionally, its three-button keypad allows for quick and easy adjustments and configurations, without the need for additional tools. This facilitates the operation and maintenance of the device, ensuring that protection parameters are always optimised.

Installation and Compatibility

The CBS-40A is designed to be installed on a DIN rail, simplifying its integration into standard electrical panels. Its V0 self-extinguishing plastic enclosure ensures greater durability and safety, protecting the internal components against possible fires or overheating. Moreover, the device is certified under international standards such as IEC 60947-2-M and IEC 62020-1, guaranteeing its quality and safety.

Technical Specifications:

• Code: P12A70
• Number of relays: 4 differential trip relays, 1 pre-alarm relay
• Sensitivity (IΔn): Adjustable from 0.03 A to 30 A
• Power supply: 110-230 V AC
• Delay: Adjustable from 0.1 to 5 seconds
• Frequency: 50/60 Hz
• Consumption: 7.5 VA
• Sensor type: Type A (WGC)
• Inputs: For connecting external toroidal transformers
• Outputs: 4 relay outputs, 1 pre-alarm relay
• Size: 52.5 x 118 x 74 mm
• Weight: 0.303 kg
• Protection rating: IP 30 (IP 40 on front)
• Installation category: CAT III 300 V

Standards and Safety

The CBS-40A complies with major international standards such as IEC 60947-2-M and IEC 62020-1, ensuring its reliability and safety in any environment. Additionally, it is designed to operate in a wide temperature range, from -10 ºC to +60 ºC, making it suitable for use in different types of installations and environmental conditions.

Additional Features:

• Ultra-immunised type A relay with high-frequency current filtering.
• 4 differential trip relays and 1 pre-alarm relay for enhanced protection.
• Sensitivity adjustment from 0.03 A to 30 A.
• Configurable delay time from 0.1 to 5 seconds, adapting to installation needs.
• LCD display for real-time parameter viewing.
• Compatible with external WGC/WGS toroidal transformers.

In summary, the Circuitor CBS-40A differential relay centre is an advanced solution for differential control and protection in electrical installations, providing a high level of safety, reliability, and energy efficiency. Ideal for installations requiring robust protection adaptable to different operating conditions.