ABB CR-M024DC4L Pluggable Interface Relay 1SVR405613R1100

Overview

The ABB CR-M024DC4L, order code 1SVR405613R1100, is a miniature pluggable interface relay from the ABB CR-M range. It has a 24 V DC coil, four changeover (SPDT) output contacts rated 250 V and 6 A, an LED that shows when the coil is energised, and an integrated test button that allows manual actuation and locking of the contacts. ABB describes pluggable interface relays as devices that provide electrical isolation, amplification and signal matching between electronic control such as a PLC, PC or fieldbus system and the sensor and actuator level. The ABB CR-M024DC4L plugs into a CR-M socket that snaps onto a DIN rail.

Seven Star LLC supplies the ABB CR-M024DC4L, matching CR-M sockets and accessories to panel builders, system integrators and plant maintenance teams across the Sultanate of Oman and the GCC. Our Muscat team checks coil voltage, contact count, socket type and function modules against the ABB data sheet with the buyer, and we hold engineering support in Muscat for interface relays used in control panels.

Operating Principle of the ABB CR-M024DC4L

ABB explains the operating mode simply: when control supply voltage is applied to A1 and A2, the output contacts change over, and when the voltage is removed the contacts fall back to their starting position. On the ABB CR-M024DC4L the 24 V DC coil has a rated power of 0.9 W and a coil resistance of 640 ohms at 20 °C with a tolerance of plus or minus 10%. The relay picks up at 19.2 V DC at 20 °C, the maximum coil voltage is 26.4 V DC at 55 °C, and it drops out at 10% of the rated voltage or more. Typical response time is 13 ms and typical release time is 3 ms for DC coils.

As general background, relays like this are used because a PLC output or an electronic signal often cannot switch the load directly, or must be kept galvanically separate from it. The ABB CR-M024DC4L takes a 24 V DC control signal and uses it to switch four independent changeover circuits, which may carry AC or DC signals at other voltages. ABB notes that interface relays do not use additional internal protective circuits and are therefore overload-proof against short variations such as current or voltage peaks.

Engineering Design of the ABB CR-M024DC4L

The ABB CR-M024DC4L measures 21.2 by 27.5 by 35.6 mm when mounted, weighs 35 g, can be mounted in any position and has IP 40 protection. Its four contacts are terminated as 11-12/14, 21-22/24, 31-32/34 and 41-42/44, with the coil on A1 and A2. Contact material is AgNi, which ABB specifies as cadmium-free. The test button is blue on DC versions and orange on AC versions and can be removed if manual operation must be prevented.

The relay works with CR-M logical sockets CR-M4LS (screw) and CR-M4LC (spring), or standard sockets CR-M4SS (screw) and CR-M4SF (fork type screw), all for 2 or 4 changeover relays. The width on socket is 27 mm. Pluggable function modules of the CR-P/M series add reverse polarity protection, free-wheeling diodes, LED indication, RC elements or varistor overvoltage protection, and accessories include plastic and metal holders, a jumper bar and markers.

Key Features

The ABB CR-M024DC4L brings these features to control panel design:

• Four changeover contacts rated 250 V and 6 A switch several circuits from one 24 V DC signal.
• An integrated LED shows coil status and helps fault finding during commissioning.
• The test button allows manual actuation and locking of the contacts and can be removed when needed.
• A 0.9 W coil with 640 ohm resistance keeps the load on PLC outputs low.
• Rated free air thermal current is 6 A, with AC-15 ratings of 1 A at 230 V and 1.5 A at 120 V.
• Mechanical life exceeds 2 x 10 to the power 7 switching cycles, and electrical life exceeds 10 to the power 5 cycles at 6 A and 250 V resistive load.
• Pluggable design on DIN rail sockets lets technicians replace a relay without rewiring.
• ABB lists approvals including UL 508, CAN/CSA C22.2 No.14, VDE, GOST, Lloyds Register for 4 c/o versions and CCC, with CE marking.

Industrial Applications

Interface relays are found in nearly every control panel. The ABB CR-M024DC4L is typically used to multiply a single PLC output into several contacts, to switch AC pilot circuits such as contactor coils, alarm lamps and horns from 24 V DC logic, to separate field signals from DCS or PLC inputs, and to build simple interlocks in motor control centres, pump panels and packaged skids. With four changeover contacts in a compact case, it saves panel space where several separate circuits need to follow one command.

In Oman, panel builders in Muscat and Sohar use relays of this type in water pumping stations, desalination skids, HVAC and district cooling controls, oil and gas wellhead control panels and building management systems. Seven Star LLC supplies the ABB CR-M024DC4L together with related control components such as the ABB TA25DU6.5 thermal overload relay, the Pilz PNOZ s4 safety relay for emergency stop circuits and the Siemens SM 1223 digital I/O module whose outputs often drive interface relays.

Ordering Notes

In the CR-M type code, 024DC means a 24 V DC coil, 4 means four changeover contacts and L means an LED is fitted. Close variants in the same ABB data sheet are the CR-M024DC4 (1SVR405613R1000) without LED, the CR-M024DC4LD (1SVR405614R1100) with LED and free-wheeling diode, the CR-M024DC4LG (1SVR405618R1100) with gold contacts for low-level signals, and the CR-M024DC4LDG (1SVR405618R1400) with gold contacts, LED and diode. ABB states a packing unit of 10 pieces. When ordering the ABB CR-M024DC4L, also select the socket, holder and any function module needed for coil suppression.

Technical Specifications

The table below summarises the ABB CR-M024DC4L data from the ABB CR-M data sheet:

How to Order

To order the ABB CR-M024DC4L, send Seven Star LLC the quantity, preferred socket type and any function modules or holders you need, and our team in Muscat will prepare a formal quotation. The ABB CR-M data sheet can be downloaded from this page, and we provide engineering support in Muscat for ABB CR-M024DC4L relays and accessories for customers across Oman and the GCC.