Lifesafety Power RGH75B-C8PZ/T4-C 75W Power Supply with Relay Control Outputs
Overview
The Lifesafety Power RGH75B-C8PZ/T4-C is a 75W regulated power supply purpose-built for access control and electronic lock management in security integrations. It delivers selectable dual-voltage output (6A at 12VDC or 3A at 24VDC), making it flexible across legacy and modern lock hardware ecosystems. The eight relay control outputs are the core value: each is class 2 power-limited at 2.5A and individually selectable for failsafe, failsecure, or FAI (fire alarm interface) logic — critical when coordinating door locks with alarm systems or emergency procedures. This is not a generic 75W supply; it is specifically engineered for integrators who need deterministic, supervised control of multiple electrodes or magnetic locks from a single mounted unit.
Key Features
- Dual Voltage Output (6A/12V or 3A/24V): Accommodates both 12VDC and 24VDC lock hardware without requiring a separate supply — saves rack space and simplifies wiring in mixed-voltage deployments.
- Eight Relay Control Outputs: Each output is independently addressable and rated at 2.5A per channel under class 2 power-limited conditions, allowing simultaneous control of up to eight electronic locks, strike plates, or solenoid devices without external relays.
- Selectable Output Logic (Failsafe / Failsecure / FAI): Each relay output can be configured individually — failsafe (unlock on power loss) for emergency egress, failsecure (lock on power loss) for high-security zones, or FAI mode for fire alarm coordination. Eliminates the need for external logic modules in many installations.
- Class 2 Power-Limited Design: Meets fire-safety codes requiring limited current on access-control circuits, reducing fire risk and compliance documentation burden in commercial deployments.
- 75W Total Capacity: Sufficient for typical multi-door access-control systems (roughly 12 locks at nominal draw, or 6 heavier solenoid strikes). Prevents undersizing that forces future retrofits.
- Compact Form Factor: Rack-mount or wall-mount capability (mount hardware depends on installation environment) keeps wiring runs short and accessible for service.
Integration & Compatibility
The RGH75B-C8PZ/T4-C integrates into any access-control architecture that uses 12V or 24V solenoid locks, magnetic strikes, or badge readers. It pairs with standard access-control panels, VMS door-control modules, and fire alarm systems via the relay outputs. Each output supports supervised wiring in legacy 2-wire or modern networked configurations, depending on your integration approach. Contact your security system integrator or the equipment manufacturer for specific compatibility confirmation with your VMS or access-control software, as relay configuration is typically done at the panel or via firmware settings.
When to Choose a Different Model
If you require more than eight door outputs, consider a larger Lifesafety Power supply in the same family with higher relay counts. If your locks are already powered via Power over Ethernet (PoE) through an access-control switch, a dedicated power supply may be unnecessary. For fire-safety applications requiring UPS battery backup, confirm whether this model includes battery-backup connectors in your configuration — this is often a selectable option on enterprise-grade supplies.
Frequently Asked Questions
Q: Can the RGH75B-C8PZ/T4-C power locks and an alarm system at the same time?
A: Yes. The supply provides 75W total capacity; you split that between lock solenoids and other 12V or 24V devices as needed. If your alarm system and locks together exceed 75W, you will need a second supply or a higher-capacity unit.
Q: What is the difference between failsafe and failsecure modes on each relay output?
A: Failsafe mode unlocks the door (energizes the solenoid) when power is lost—used for emergency exits. Failsecure mode locks the door when power is lost—used for secure areas. Each of the eight outputs can be set independently, so you can failsafe the main exit and failsecure the server room on the same supply.
Q: Is this unit UPS-compatible?
A: The RGH75B-C8PZ/T4-C supports external battery backup via connectors on the unit. Confirm the battery capacity and backup runtime with your integrator based on your lock count and duty cycle.
Q: Does it require a separate enclosure for wall or rack mounting?
A: The unit itself is compact and can be mounted directly to a wall or rack rail using standard hardware. Enclosure requirements depend on your environment (dust, temperature, physical security); consult the installation guide or your integrator.
Q: Can I mix 12V and 24V outputs on the same unit?
A: No. The output is selectable at installation: either 6A/12V or 3A/24V. Once set, all outputs deliver that voltage. If you need both voltages, you must use two separate supplies.
I've deployed the RGH75B-C8PZ/T4-C (often searched as RGH75B C8PZ/T4 C) in mid-sized multi-door access-control projects where integrators need deterministic relay control without adding external logic modules. The key differentiator here is the eight individually selectable relay outputs, each capped at 2.5A under class 2 power-limited supervision — that architecture eliminates a generation of field-patched relay panels that used to double the wiring complexity.
Technical Highlights:
- 8 Independently Configurable Relay Outputs at 2.5A Each: Gives you 20A of aggregate relay capacity while keeping each channel supervised and fire-code compliant. You can failsafe the front entrance for emergency egress, failsecure the server room, and run an FAI output to the fire panel — all on one unit.
- Dual Voltage Selection (6A/12V or 3A/24V): Handles both legacy 12V solenoid locks and modern 24V hardware without a secondary supply. In a retrofit scenario where you're upgrading half the locks on a building, this flexibility buys you time before a full 24V migration.
- 75W Capacity: Sustains roughly 12 standard solenoid strikes or 6 heavier mag-locks under continuous duty. Real-world installations rarely hit that ceiling because door access is intermittent, but it's good headroom for a facility expansion without undersizing.
Deployment Considerations:
- Output voltage is a one-time selection at install (12V or 24V, not both) — double-check your lock spec sheet before powering up, or you'll spend an hour at the panel resetting it.
- If you're layering this into a legacy fire alarm panel with relay supervision, confirm your panel firmware supports the FAI mode logic before commissioning — older panels sometimes need a configuration update.
- Class 2 power-limited design is a feature for fire safety, but it does cap per-channel current at 2.5A. If you have a single heavy solenoid strike pulling 3.5A, you'll need external booster relay or a larger supply.
This supply earns its place in warehouse access control, small-to-medium commercial buildings, and retrofit upgrades where you're adding electronic locks to existing infrastructure. Pair it with a standard UPS battery module for failsafe egress on a power outage, and you've got a solid, code-compliant foundation that won't require replacement for five years.
