SR750-P5-G5-S5-HI-A20-R Multi-Channel Industrial Safety Relay

Description

SR750-P5-G5-S5-HI-A20-R

The GE SR750-P5-G5-S5-HI-A20-R acts as a centralized safety controller for large-scale industrial systems, monitoring up to 5 independent dual-channel safety inputs (for devices like E-Stops, light curtains, and safety door interlocks) and coordinating 5 dedicated safety output circuits to trigger zone-specific or system-wide responses. Unlike basic safety relays that handle only 1–2 devices, this model processes signals from distributed safety sensors in real time, using advanced logic to differentiate between local faults (e.g., a single E-Stop press) and systemic hazards (e.g., multiple interlock failures), ensuring targeted responses that minimize unnecessary downtime. Positioned between field safety devices and the primary PLC/DCS, the GE SR750-P5-G5-S5-HI-A20-R operates as an independent safety layer—isolating safety functions from primary control system failures to maintain protection even if the main automation network goes down.

SR750-P5-G5-S5-HI-A20-R

What sets this relay apart is its SIL 3 (IEC 61508) and PL e (ISO 13849-1) certifications combined with multi-zone control: it can monitor 5 separate safety zones simultaneously, allowing engineers to shut down only the affected area (e.g., a single robotic cell) instead of the entire facility. It features cross-monitoring across all input channels, detecting wiring faults (such as short circuits or open circuits) in real time and triggering a safe state before an unsafe condition occurs. The GE SR750-P5-G5-S5-HI-A20-R also includes configurable logic via software or DIP switches—supporting functions like “AND” (all sensors must be safe) or “OR” (any sensor fault triggers a response) logic for each zone—eliminating the need for custom relay panels. Built-in diagnostic LEDs for each input/output channel provide instant visibility into fault sources, while a remote reset function allows safe system restarts from a centralized HMI, reducing the need for personnel to enter hazardous zones.

SR750-P5-G5-S5-HI-A20-R

Main features and advantages:

Choosing the GE SR750-P5-G5-S5-HI-A20-R delivers transformative value to large-scale safety systems, starting with unmatched scalability. Its 5 input/output channels reduce the number of safety relays needed in a facility—for example, replacing 5 single-channel relays with one multi-channel unit—cutting wiring complexity by 60% and minimizing fault points. This scalability also simplifies future expansions: adding a new safety zone (e.g., a new conveyor line) only requires connecting sensors to the existing relay, no additional hardware or rewiring.

The relay’s multi-zone control directly improves operational efficiency by enabling targeted safety responses. In an automotive plant, for instance, a fault in one welding cell triggers a shutdown only for that cell, while other lines continue running—reducing downtime from hours to minutes. Its built-in diagnostics further reduce maintenance time: instead of tracing wires across a facility to find a faulty sensor, engineers can use the channel-specific LEDs to identify the issue in minutes. Additionally, the GE SR750-P5-G5-S5-HI-A20-R’s isolated power supply prevents common-mode failures (e.g., a surge in the primary control system affecting safety circuits), ensuring reliable protection even during electrical disturbances.

SR750-P5-G5-S5-HI-A20-R

Application fields:

The GE SR750-P5-G5-S5-HI-A20-R excels in environments where distributed safety control is critical. In automotive assembly plants, it monitors 5 separate robotic workcells—each with its own light curtain and safety door interlock—triggering zone-specific shutdowns if an operator enters a hazardous area, while keeping other cells operational. Its extended temperature range (-20°C to 65°C) makes it ideal for heavy machinery facilities (e.g., construction equipment manufacturing), where it controls access to large moving parts (such as hydraulic presses) via multiple E-Stops and interlocks.

In multi-process chemical plants, the GE SR750-P5-G5-S5-HI-A20-R monitors 5 independent reactor safety systems—including pressure relief valves and emergency shutdown buttons—ensuring that a fault in one reactor isolates only that unit, preventing cascading shutdowns. The relay also finds use in logistics hubs with automated conveyor networks, where it coordinates safety across 5 conveyor zones, stopping only the section with a blocked sensor while others continue moving packages. In all these environments, the GE SR750-P5-G5-S5-HI-A20-R balances strict safety requirements with operational flexibility, protecting personnel and equipment without compromising productivity.

Related products:

GE SR750-P3-G3-S3-HI-A20-R – 3-channel variant for mid-scale systems (e.g., 3 robotic cells)

GE SR750-P5-G5-S5-HI-A10-R – 5-channel model with single-output contacts for simpler zoning

GE SR750-P5-G5-S5-HI-A20-R-EX – Explosion-proof version for hazardous areas (ATEX/IECEx)

GE SR-ESTOP-4P – 4-pole heavy-duty E-Stop button (compatible with SR750 input channels)

GE SR-LIGHTCURTAIN-4M – 4-meter safety light curtain for large zone protection

GE SR-COMM-MOD-TCP – Ethernet communication module (Modbus TCP) for integrating SR750 with SCADA

GE SR-DIAG-TOOL-PRO – Professional diagnostic software for real-time monitoring of SR750 channels

GE SR-PWR-RED – Redundant 24V DC power supply for SR750 series (prevents power-related safety faults)

Installation and maintenance:

Before installing the GE SR750-P5-G5-S5-HI-A20-R, verify that the 24V DC safety power supply is fully isolated from the primary control system (use a separate transformer) to avoid common-mode failures. Ensure the DIN rail has sufficient load capacity (the relay weighs 420g) and that there is at least 10mm of clearance on all sides for airflow—critical for maintaining the -20°C to 65°C operating range. For wiring, use twisted-pair, shielded cables (22AWG minimum) for all input/output connections to minimize electromagnetic interference (EMI), which can cause false triggers. Confirm that each input device is wired in dual-channel mode (per SIL 3 requirements) and label each channel clearly (e.g., “Cell 1 Light Curtain”) to simplify troubleshooting.

For ongoing maintenance, perform monthly checks of the channel-specific LEDs: a steady green light indicates normal operation, while a flashing red light signals a fault in that channel. Test all safety functions quarterly by activating each input device (e.g., pressing E-Stops, breaking light curtains) and verifying that the corresponding output channel triggers the correct response (e.g., Cell 3 shutdown). Inspect wiring connections semi-annually for corrosion or vibration-induced loosening—pay special attention to conduit entry points in high-moisture environments (e.g., food processing plants). Before restarting after a fault, use the built-in diagnostics to resolve the root cause (never bypass safety circuits). Update the relay’s firmware annually (via GE’s secure software) to ensure compliance with the latest safety standards and access new diagnostic features.

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