Altronix TM400K1D 4A/4 PTC Output Access Control Power Supply for Mercury 2-3 Door Systems

Overview

The Altronix TM400K1D is a dedicated access control power supply engineered specifically for Mercury-based 2-to-3 door deployments. Delivering 4 amps across 4 individually PTC-protected outputs at 115V AC input, it brings structured, protected power distribution to the panel and locking hardware side of a Mercury access control installation — a category where undersized or unprotected supplies routinely cause nuisance lockouts and difficult-to-diagnose field failures. If you're commissioning a small-to-midsize Mercury panel system and need a power solution that's matched to the platform, the TM400K1D is purpose-built for that role.

Altronix access control power products are a go-to for integrators running panel-centric architectures, and the TM400K1D fits squarely in that lineage. For broader context on pairing power supplies with door controllers, the access control category covers compatible readers, panels, and locking hardware.

Key Features

• 4A Total Output Capacity: Four amps of continuous current capacity gives you enough headroom to drive multiple electric strikes, maglocks, or REX devices simultaneously across a 2-to-3 door system without chasing brownout-induced unlock failures during peak access events.
• 4 Individually PTC-Protected Outputs: Polymeric positive temperature coefficient (PTC) circuit protection on each output means a short or overload on one door's hardware won't collapse power to adjacent doors. PTC devices self-reset after a fault clears — no blown fuses to swap during a service call, and no cascading failures across the installation.
• 2-3 Door Mercury Compatibility: Built to pair with Mercury access control panels in 2-to-3 door configurations. Selecting a supply that's spec'd for your panel architecture avoids the mismatch problems that come from using generic supplies with Mercury hardware — sizing, voltage regulation, and load sequencing are all factored in.
• 115V AC Input: Standard North American 115V AC input means no transformer adapters or special wiring runs — plug it into a standard commercial circuit. This keeps installation straightforward and the power path simple to document for inspectors.
• Structured 4-Output Distribution: Four discrete output terminals allow you to run dedicated home-run wiring to each door's locking device rather than daisy-chaining. Dedicated runs simplify fault isolation: if a door stops responding, you can isolate that output immediately rather than tracing a shared wire run.

Integration & Compatibility

The TM400K1D is designed for Mercury access control panel deployments in the 2-to-3 door range — the segment where a dedicated, protected supply makes the most operational sense. Mercury-based systems are widely deployed through integrators running platforms like Lenel, CCURE, Genetec, and Software House, all of which use Mercury as the hardware layer. The TM400K1D handles the power infrastructure side, keeping the panel and locking hardware properly sourced regardless of which software platform sits above it. Pair it with an appropriate electric locking device rated within the 4A envelope, and you have a clean, protected power architecture for a small commercial door system.

Frequently Asked Questions

Q: What Mercury panel configurations does the TM400K1D support?

A: The TM400K1D is rated for 2-to-3 door Mercury access control systems. It is not specified for single-door or large multi-door Mercury deployments beyond 3 doors.

Q: How does PTC circuit protection differ from fused outputs on a power supply?

A: PTC (Polymeric Positive Temperature Coefficient) devices are resettable — they limit current during a fault and automatically restore once the overload clears and the device cools. Fused outputs require physical fuse replacement after a fault. For access control installations, PTC protection reduces service calls caused by blown fuses on door hardware circuits.

Q: Can the TM400K1D power both the Mercury panel and the locking hardware from the same supply?

A: The TM400K1D provides 4A across 4 outputs. Whether that capacity covers both panel logic and locking devices simultaneously depends on the specific Mercury panel model and the type and quantity of locks installed. Verify your total load against the 4A ceiling before combining both load types on a single supply.

Q: What input voltage does the TM400K1D require?

A: The TM400K1D requires 115V AC input — standard North American commercial voltage. It is not rated for 230V AC or international mains without additional conditioning.

Q: How many outputs does the TM400K1D provide and are they independently protected?

A: The TM400K1D provides 4 outputs, each individually protected by a PTC circuit protection device. A fault or overload on one output does not affect the remaining outputs.

Ted Perry

The TM400K1D is the kind of supply that prevents the frustrating class of access control failures that never trace back to the panel — they trace back to the power side. That 4A ceiling across 4 PTC-protected outputs is the right architecture for a 2-to-3 door Mercury build: enough current for strikes or maglocks plus REX devices, and per-output protection that keeps a shorted lock from taking down adjacent doors. I've seen installs where a single unprotected supply feeds three doors off a shared rail — one wiring fault and the whole wing goes unsecured. The TM400K1D is specifically designed to prevent that failure mode.

Technical Highlights:

• 4A Output Capacity: Covers the combined load of multiple electric strikes or maglocks across a 2-3 door Mercury system without voltage sag under simultaneous access events.
• 4x PTC-Protected Outputs: Self-resetting protection on each of the 4 outputs eliminates fuse-swap service calls and prevents cross-output fault propagation — critical in 24/7 commercial door environments.
• 115V AC Input: Directly compatible with standard North American commercial circuits; no step-down transformer required, keeping the installation clean and the power path easy to inspect and document.

Deployment Considerations:

• Before combining panel logic power and lock power on the same supply, add up your actual load — Mercury panel current draw plus lock inrush must stay under 4A total or you'll trigger PTC limiting on access events.
• The TM400K1D is specified for Mercury platform deployments in the 2-3 door range; using it as a generic power source outside that architecture loses the platform-matched sizing benefit and may leave you undersized for larger lock arrays.

This supply is the right fit for small commercial retrofits or new construction where a Mercury panel is handling a lobby, a restricted corridor, or a two-door server room suite — environments where clean, isolated power per door is non-negotiable and service access is limited.