Basler CEM‑2020 Contact Expansion Module

The Basler CEM‑2020 is a contact expansion module designed to increase the output contact capacity of Basler protective relays and control systems. It provides additional form‑C relay outputs for tripping breakers, annunciation, and control functions, enabling complex protection schemes without requiring multiple relay units. It is an essential accessory for systems requiring more outputs than the host relay can provide.

Key Features

The CEM‑2020 features multiple independent relay contacts with high breaking capacity. It includes LED indication for each output channel. The module is optically isolated from the host system to prevent noise coupling. It is housed in a compact, rugged enclosure suitable for panel mounting.

Technical Specifications

Power supply: 24 VDC or 48 VDC from host system. Output contacts: 8 form‑C relays, rated at 5 A at 250 VAC/30 VDC. Operating temperature: -20°C to +60°C. Response time: less than 5 ms. Connections: screw terminals for secure wiring. The module is designed for direct connection to Basler relays via ribbon cable or terminal blocks.

Operating Principles

The CEM‑2020 receives logic signals from the host relay or controller. When a signal is asserted, the corresponding relay coil is energized, closing or opening the output contact. The isolated design ensures that the control circuits are protected from voltage spikes generated by the load switching.

Applications

This module is used with Basler BE1‑GPS, BE1‑11, and DECS series controllers to expand output capability. It is ideal for applications requiring multiple trip circuits, alarm outputs, or control signals.

Installation and Configuration

Mount the module on a DIN rail or panel. Connect the power supply and output wiring. Interface with the host relay using the provided cable. No user configuration is typically required.

Maintenance and Reliability

Solid‑state design with high‑quality relays ensures long service life. Routine inspection of connections is recommended.

Conclusion

The Basler CEM‑2020 contact expansion module provides reliable and versatile output expansion for Basler protection and control systems, enabling complex and comprehensive protection schemes.