X-21S – ControlByWeb® | Four Relay Form C / SPDT Expansion Module

Description

The ControlByWeb® X-21S is a 4-relay expansion module designed to scale I/O capacity for the X-400™ and X-600M™ controllers. It provides four independent Form-C (SPDT) relays, each rated for light-duty switching up to 2.5A. This module is an ideal solution for applications requiring the management of moderate loads such as solenoid valves, alarm systems, and status indicators.

Engineered for simple, stackable integration, the X-21S connects to the master controller via a ribbon cable that handles both power and communication. This bus-powered design eliminates the need for separate power supplies, allowing for clean, efficient hardware expansion in larger control systems. With its compact footprint and LED status indicators, the X-21S provides a reliable, plug-and-play method to expand your network-controlled relay capacity.

Key Features

• Expandable Relay Capacity: Adds 4 Form-C (SPDT) relays to existing X-400™ or X-600M™ installations.
• Bus-Powered Design: Receives power and communications via the ribbon cable expansion bus; no external power supply required.
• Light-Duty Switching: Relays rated for 2.5A (125VAC / 28VDC) for versatile load management.
• Status Monitoring: Integrated LED indicators for clear relay and power status visualization.
• Compact & Modular: Designed for space-efficient installation in control cabinets.
• Flexible Connectivity: Removable terminal connectors ensure quick and reliable wiring.

Specifications

x-21s

x-21s-users-manual