Lifesafety Power RGH75B-C8PZ/T4-D 75W power supply 6A/12V or 3A

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Lifesafety Power RGH75B-C8PZ/T4-D 75W Access Control Power Supply

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Overview

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The Lifesafety Power RGH75B-C8PZ/T4-D is a purpose-built 75W regulated power supply for access control and electronic lock management in facilities where lock control must operate independently of building power infrastructure. It delivers either 6A at 12VDC or 3A at 24VDC to powered access control endpoints—magnetic locks, door controllers, and strike mechanisms—with eight discrete relay outputs for lock supervision and failsafe/failsecure configuration.

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This modular supply is designed for integrators specifying lock control systems where per-output supervision is non-negotiable and individual failsafe/failsecure logic is required to meet egress and life-safety code compliance. The RGH75B-C8PZ/T4-D bridges the gap between simple unmanaged power and expensive intelligent door controllers by providing supervised, configurable lock power in a compact form factor.

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Key Features

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• Dual Output Voltage Options—12VDC @ 6A or 24VDC @ 3A: Select based on your lock coil and controller voltage requirements. 12V supplies higher current for multiple parallel locks or long wiring runs; 24V reduces wire gauge and voltage drop over distance, lowering installation labor in large facilities.
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• Eight Class 2 Power-Limited Relay Outputs: Each relay is individually rated at 2.5A maximum per channel. Class 2 power-limiting inherently caps short-circuit current, reducing arc risk and eliminating the need for external fuses on each lock circuit—this simplifies wiring in jurisdictions with strict code-compliance inspections and reduces nuisance breaker trips from contact bounce.
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• Per-Output Failsafe/Failsecure Selectable: Configure each of the eight outputs independently: failsafe mode (de-energized = locked) for life-safety egress compliance, or failsecure mode (energized = locked) for high-security areas. This flexibility lets you mix lock logic on a single supply without additional controllers.
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• Modular Form Factor: Compact enclosure fits standard 19-inch rack mounting or wall installation in electrical closets, reducing real-estate burden compared to larger uninterruptible power supplies. Modular design also simplifies field replacement without decommissioning the entire access control infrastructure.
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• AC Input with Regulated DC Output: Standard 120/240V AC mains input with regulated DC output minimizes voltage fluctuation to locks—critical for magnetic lock coils, which can chatter or fail to engage reliably under brownout conditions. Regulation also protects downstream access control electronics from power transients.
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• Integrated Supervision—No External Monitoring Relays Required: Each relay output includes built-in supervision logic that can be configured to report lock state back to your access control panel or building automation system without additional monitoring hardware.
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Integration & Compatibility

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The RGH75B-C8PZ/T4-D integrates into access control systems that require discrete relay switching for strike control, electric latch retraction, or solenoid management. Before final specification, verify that your control panel or lock management system supports 12VDC or 24VDC input and can accept relay-style supervision signals. Each relay output must be sized and wired according to the load (lock coil current draw, typically 0.5–2.5A for standard mag locks) and your failsafe or failsecure mode selection.

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Confirm that your facility's electrical infrastructure can supply adequate AC mains current (approximately 7–8A at 120V for full load) and that a dedicated circuit or UPS integration is available if power loss cannot tolerate lock de-energization. Document failsafe/failsecure configuration on each output during commissioning to prevent nuisance lock failures during shift changes or system resets.

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Frequently Asked Questions

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Q: What is the maximum current per relay output on the RGH75B-C8PZ/T4-D?

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A: Each of the eight relay outputs is rated for a maximum of 2.5A. If your magnetic lock draw exceeds 2.5A, you will need to parallel multiple relay outputs or use an external relay module rated for higher current.

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Q: Can I mix 12VDC and 24VDC outputs on the same unit?

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A: No. The RGH75B-C8PZ/T4-D delivers either 12VDC @ 6A or 24VDC @ 3A—you select one voltage configuration per unit. If your facility requires both voltage levels, specify two supplies, one for each voltage class.

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Q: What does "Class 2 power-limited" mean for my installation?

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A: Class 2 power-limiting means the output circuits are inherently current-limited—short circuits or faults won't produce dangerous arc conditions. This reduces the need for individual fuses or breakers on each lock circuit and simplifies code compliance in jurisdictions with strict electrical safety requirements.

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Q: Can the RGH75B-C8PZ/T4-D supervise lock state back to my access control panel?

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A: Yes. The eight relay outputs include supervision capability. Each output can be configured to report lock position (open/closed or energized/de-energized) back to your access control system to detect tamper, lock failure, or door-open alarms.

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Q: Does the RGH75B-C8PZ/T4-D include battery backup for power loss?

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A: No. The supply itself provides no battery backup. If your installation requires locks to remain powered during a mains outage, integrate an UPS or battery backup system upstream of the RGH75B-C8PZ/T4-D input, or use backup power-holding solenoids on your door hardware.

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Q: What wiring gauge do I need for 12VDC at 6A over distance?

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A: Wire gauge depends on distance and acceptable voltage drop. For runs under 50 feet at 6A, use AWG #10 or larger; for longer runs, consult the National Electrical Code or your integrator's voltage-drop calculation. This is one reason 24VDC operation is preferred in large facilities—it allows smaller gauge wire for the same power delivery.

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