ABB RB121-12VDC is a compact R600 boxed interface relay with a 12 V DC control supply, one changeover contact, 10 mA–6 A switching range, screw terminals and integrated LED indication.
The ABB RB121-12VDC is a compact and reliable R600 boxed interface relay designed for electrical isolation, signal amplification and signal matching between electronic control equipment and field devices in industrial automation systems. Its slim design makes it particularly suitable for PLC panels, machinery and control cabinets where efficient use of DIN rail space is important.
This R600 relay operates from a 12 V DC rated control supply and provides 1 c/o (SPDT) output contact. The relay is specified for a switching current range of 10 mA–6 A, providing a versatile interface for industrial control circuits, actuators and other switched loads.
With ABB order code 1SNA645073R0000, the RB121-12VDC features screw terminals, an integrated LED for clear relay status indication and a compact housing only 6 mm wide. Its DIN rail format supports straightforward installation in industrial automation and machine control assemblies.
Key Advantages
Compact R600 boxed interface relay for industrial automation applications.
12 V DC control supply for low-voltage control systems.
10 mA–6 A switching current range for industrial control loads.
Compact 6 mm housing width saves valuable DIN rail space.
Integrated LED status indication simplifies commissioning and troubleshooting.
Screw terminals provide secure and convenient field wiring.
Designed for electrical isolation, amplification and signal matching in automation systems.
Key Features
ABB R600 interface relay series.
12 V DC rated control supply voltage.
1 c/o (SPDT) output contact.
10 mA–6 A switching current range.
Switching voltage up to 250 V AC.
Silver tin oxide (AgSnO2) contact material.
Integrated LED relay status indicator.
Screw terminal connection system.
Compact 6 mm wide housing.
DIN rail mounting for industrial control panels.
Reliable Signal Interfacing for Industrial Automation
Interface relays such as the ABB RB121-12VDC provide a practical switching interface between electronic control systems and field-level equipment. The relay allows a 12 V DC control circuit to operate an independent changeover contact, helping provide electrical isolation and signal matching between PLCs, controllers, sensors, actuators and other industrial devices.
The ABB R600 range is designed for compact industrial installations requiring reliable switching with minimal panel space. The RB121-12VDC combines a slim housing, integrated LED indication and screw-terminal connections with a versatile changeover contact, making it suitable for machine building, process control and general industrial automation.
Typical Applications
PLC input and output interfacing.
Industrial control and automation panels.
Electrical isolation between control and load circuits.
Machine control systems and OEM equipment.
Signal amplification and matching applications.
Switching contactors, indicators and control circuits.
Process automation and instrumentation systems.
Compact DIN rail control cabinet assemblies.
Technical Specifications
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Terminal Type
Screw
Load Voltage
250 V AC
Mounting Type
DIN rail
Switching Current (A)
6 A
Series
R600
ABB order code
1SNA645073R0000
Product type
Boxed interface relay
Rated control supply voltage
12 V DC
Output contacts
1 c/o (SPDT)
Switching current
10 mA–6 A
Maximum switching voltage
250 V AC
Contact material
Silver tin oxide (AgSnO2)
Status indication
Built-in LED
Terminal type
Screw terminals
Mounting type
DIN rail
Dimensions (H × W × D)
67.5 × 6 × 70 mm
Net weight
0.02 kg
Product group
310923 – Interface Relays & Opt. Couplers
Frequently Asked Questions
What is the ABB RB121-12VDC used for?
The ABB RB121-12VDC is an R600 interface relay used for electrical isolation, signal amplification, signal matching and switching between electronic controls and field devices in industrial automation systems.
What control voltage does the ABB RB121-12VDC require?
The RB121-12VDC operates from a rated control supply voltage of 12 V DC.
How many contacts does the RB121-12VDC have?
The relay provides one changeover contact (1 c/o or SPDT), giving normally open and normally closed switching paths.
What is the switching current range of the ABB RB121-12VDC?
The RB121-12VDC is specified for switching currents from 10 mA to 6 A.
Does the ABB RB121-12VDC have an LED indicator?
Yes. The relay incorporates a built-in LED that provides visual indication of relay energisation.
What type of terminals does the RB121-12VDC use?
The RB121-12VDC uses screw terminals for secure electrical connections in industrial control panels.
How wide is the ABB RB121-12VDC?
The relay has a compact width of only 6 mm, making it well suited to high-density DIN rail installations.
Trusted by Industrial Automation Professionals Worldwide
ABB R600 interface relays are used for dependable electrical isolation, amplification and signal matching in industrial automation, providing machine builders, panel builders and control engineers with compact switching solutions for PLC, machinery and process control applications.
Terminal Type
Screw
Load Voltage
250 V AC
Mounting Type
DIN rail
Switching Current (A)
6 A
Series
R600
ABB order code
1SNA645073R0000
Product type
Boxed interface relay
Rated control supply voltage
12 V DC
Output contacts
1 c/o (SPDT)
Switching current
10 mA–6 A
Maximum switching voltage
250 V AC
Contact material
Silver tin oxide (AgSnO2)
Status indication
Built-in LED
Terminal type
Screw terminals
Mounting type
DIN rail
Dimensions (H × W × D)
67.5 × 6 × 70 mm
Net weight
0.02 kg
Product group
310923 – Interface Relays & Opt. Couplers
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This productManufacturer Lead Time
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LED Controls is a specialist distributor of factory automation and industrial controls, supplying OEMs, machine builders, panel builders and end users throughout the UK and worldwide. As a trusted UK distributor for many of the world’s leading automation manufacturers, we provide industrial control products, technical expertise and bespoke automation solutions backed by outstanding customer service.
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