ABB SENTRY SSR20M 85-265AC 120-375DC 3no 1nc

Why Choose the ABB SENTRY SSR20M 2TLA010051R0100 Safety Relay?

The ABB SENTRY SSR20M 2TLA010051R0100 is a versatile safety relay for monitoring two-hand control devices in industrial machinery and automation systems. Part of the ABB Sentry safety relay range, the SSR20M provides 3 normally open (NO) and 1 normally closed (NC) relay output together with a wide-range AC/DC power supply for flexible integration into machine safety circuits.

Designed specifically for two-hand control applications, the SSR20M helps ensure that machine operation is initiated through the required simultaneous operator control arrangement. The reset function can be configured for manual or automatic reset using a selector switch on the front of the relay, allowing straightforward adaptation to the required machine safety architecture.

The 2TLA010051R0100 accepts a wide 85–265 V AC at 50/60 Hz or 120–375 V DC supply, making it particularly useful where a 24 V DC control supply is unavailable. Screw terminals provide secure field wiring, while the compact 22.5 mm wide DIN-rail housing enables efficient installation in industrial control cabinets.

Key Advantages

• Purpose-designed safety relay for two-hand control monitoring.
• Wide 85–265 V AC / 120–375 V DC supply range provides flexible installation options.
• 3 NO + 1 NC relay outputs for safety-related machine control.
• Selectable manual or automatic reset from the front panel.
• Supports safety applications up to PL e / SIL 3.
• Screw terminals provide secure and serviceable field connections.
• Slim 22.5 mm housing width conserves DIN-rail space in control panels.

Key Features

• ABB SENTRY SSR20M safety relay.
• 85–265 V AC, 50/60 Hz supply capability.
• 120–375 V DC supply capability.
• 3 normally open + 1 normally closed relay outputs.
• Dedicated two-hand control device monitoring.
• Manual or automatic reset selectable by front-mounted switch.
• No integrated time-delay function.
• Screw-terminal connections.
• Compact DIN-rail mounting format.
• Designed for demanding industrial machine safety applications.

Reliable Two-Hand Safety Control for Industrial Machinery

Two-hand control systems are used where an operator must actuate two controls to initiate or maintain a potentially hazardous machine function. By requiring both hands to be positioned at the control station, these systems help keep the operator's hands away from the hazardous operating area during machine initiation.

The ABB SENTRY SSR20M is specifically designed to monitor these two-hand devices and provide safety-related relay outputs for interfacing with machine contactors and control systems. Its wide-range AC/DC power supply is especially advantageous when integrating safety functionality into machinery operating with higher control voltages, while selectable manual or automatic reset simplifies configuration for different applications.

Typical Applications

• Two-hand control stations for industrial machinery.
• Presses and forming equipment.
• Cutting and processing machinery.
• Assembly and production equipment.
• Operator-controlled hazardous machine cycles.
• Manufacturing and factory automation systems.
• OEM machinery and machine-building projects.
• Industrial safety control panels requiring a wide AC/DC supply range.