ABB 1SR440721R0000 Logic Relay

We will arrange delivery within 3-5 days after receiving the payment.

Our express delivery: DHL and FedEx.

Quality packing for each product

Destination country all taxes & duty to be paid by buyer

Only part of the brand and model, if you have other product needs, please contact us.

1. Product Overview

The ABB 1SR440721R0000 is a high-reliability logic relay used in industrial automation for logic control, signal processing, and circuit interfacing. It supports multiple logic functions such as AND, OR, delay, and toggle, and is widely applied in control panels, production lines, and automation systems for flexible control strategies.

2. Technical Specifications

• Model: 1SR440721R0000

• Type: Logic Relay

• Input Voltage: 24 V DC

• Contact Configuration: 2 NO + 2 NC (model dependent)

• Contact Rating: AC 250 V / 5 A, DC 30 V / 5 A

• Logic Functions: AND, OR, Delay, Toggle, etc.

• Control Method: Relay input signals control logic output

• Mounting: DIN rail

• Operating Temperature: ‑25 °C to +55 °C

• Protection Rating: IP20

• Response Time: 10–20 ms (typical)

• Standards: IEC 60947-4-1 / EN 60947-5-1

3. Key Advantages & Features

1. Flexible Logic Control – Supports multiple logic combinations for complex control strategies.

2. High Reliability – Industrial-grade design ensures stable long-term operation.

3. Compact Design – DIN rail mounting saves space in control panels.

4. Fast Response – Millisecond-level switching for automation speed requirements.

5. Modular Structure – Easy to install, replace, and expand for system maintenance.

6. Wide Compatibility – Works with PLCs, DCS, sensors, and other control modules.

4. Typical Applications

• Industrial automation production line control

• Logic signal processing in control cabinets

• Machine tools and processing equipment automation

• HVAC system control

• PLC/DCS auxiliary control modules

5. Installation & Usage Notes

1. Voltage Matching – Ensure relay supply voltage matches the nominal rating.

2. Proper Wiring – Connect input/output terminals according to wiring diagram.

3. Environmental Conditions – Avoid high humidity, dust, and corrosive environments.

4. Regular Inspection – Check contact status and logic operation for reliability.

5. Secure Mounting – Ensure relay is firmly mounted to prevent vibration affecting performance.