Product Details

Modicon DBK021 is a compact intermediate relay and reliable signal switching relay widely adopted inside legacy Modicon automation control cabinets. This legacy relay unit amplifies weak logic signals output from PLC I/O modules and drives external loads such as solenoid valves, indicator lamps and auxiliary contactors. It provides effective electrical isolation between the low‑voltage control side and high‑power load side, protecting valuable PLC cards from surge voltage and back EMF damage. Built with stable silver alloy contacts, this intermediate relay supports frequent switching cycles and maintains dependable conductivity under continuous factory operation. As a discontinued legacy spare, this signal switching relay serves as a drop‑in replacement for burnt or ageing relay components, allowing old automation racks to restore safe automatic switching without cabinet reconstruction.

Basic Parameters

Brand: Modicon

Model: DBK021

Product Type: Intermediate Signal Relay

Coil Voltage: 12 VDC

Contact Configuration: SPDT, 4‑pin construction

Rated Contact Current: 5 A

Rated Contact Voltage: 250 VAC

Termination: Pin socket mounting

Installation: Socket base mounting on control panel

Product Status: Discontinued legacy spare

Net Weight: Approximately 0.07 kg

Supported Functions

This intermediate relay supports signal amplification and electrical isolation for PLC control circuits. The signal switching relay executes on‑off action triggered by automation logic and provides auxiliary contact feedback for interlock and alarm circuits. This legacy relay unit can be matched with standard relay sockets for quick disassembly and replacement, greatly shortening downtime during on‑site maintenance.

Core Functions

As an essential signal switching relay, this intermediate relay converts low‑level drive signals from the PLC into reliable switching power for field loads. Its isolated contacts separate control and power loops to suppress electrical noise and transient surges. This legacy relay unit acts as a direct spare to restore safe load switching for ageing Modicon automation racks.

Hardware Specifications & Environmental Features

Operating Temperature: -10°C ~ +60°C

Storage Temperature: -20°C ~ +70°C

Relative Humidity: 5%–95%, non-condensing

Housing: Flame-retardant plastic shell

Contact Material: Silver alloy for arc resistance

Anti-interference: Built-in coil suppression diode

Compatibility: Matches 800 series backplane and compatible peripheral modules

Industry Applications: Applied in legacy petrochemical distributed control, old paper making production automation, material handling conveyor lines, packaging and textile machinery, water treatment remote signal collection and large conveyor remote I/O control racks.

Note: Confirm 800 series backplane compatibility, pulse signal type, counting mode and preset logic before ordering.

This is from our current stock.

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