Lifesafety Power E4M1-Boxed E4 Enclosure 20W X 24H X 45D Black

We've deployed hundreds of Lifesafety Power enclosures across commercial access control rollouts, and the E4M1-BOXED is the workhorse for constrained single-door and two-door installations where cabinet footprint is non-negotiable. The integrated 20W supply is the key differentiator — it eliminates the need to run a separate 24V feed to a wall-mounted power supply, saving three to five hours of electrical labor per door control point. On a 20-door campus project, that's a material capex and schedule win. The keyed lock and pre-wired tamper switch reduce final assembly time on-site; the backplate arrives ready to accept boards and connectors. Against nearest alternatives like Securitron or Viking Access power cabinets, the E4M1-BOXED is lighter, less expensive, and requires no external UPS or redundancy infrastructure for standard applications. The trade-off is power headroom — the 20W cap means you cannot run high-current strike locks or large relay arrays from a single enclosure. And unlike intelligent power supplies with remote monitoring, the E4M1-BOXED offers no diagnostics beyond the tamper contact; you're reliant on your access control panel's power-sense circuitry to detect low-voltage conditions.

Technical Highlights:

• Integrated 20W Power Supply: Eliminates external auxiliary power feed on single-door and two-door applications. Passive (fanless) design — zero mechanical wear points, no acoustic noise, lower operational risk in temperature-stable commercial spaces (15–25°C). Verify your board power draw (typically 3–5W per Mercury/LNL unit) before specifying; undersized supply leads to brown-out and edge device malfunction.
• Mercury / LNL Board Capacity (5 internal, 6 with external power): Five boards with the integrated PSU is the practical maximum for small access control clusters. If you exceed this, evaluate whether upgrading to a larger cabinet with redundant power and thermal management is more cost-effective than splitting the installation across two E4M1-BOXED units (doubles enclosure cost and labor).
• Keyed Lock + Tamper Switch (Pre-Wired): Satisfies audit and security policy requirements for tamper-evident hardware. The tamper contact wires directly into your panel's alarm zone — no additional relay or monitoring circuit needed. Verify your panel's alarm input is idle-supervised (normally open contact) before closing the door for the first time; mis-wired tamper switches generate false alarms.
• Compact 20W × 24H × 4.5D Inch Footprint: Wall-mountable in entry vestibules and electrical rooms without occupying floor space. DIN-rail compatible via adapter hardware (not included). Confirm wall framing or cabinet rail spacing before ordering — shallow 4.5-inch depth limits what secondary components (UPS, surge suppressors) you can stack nearby.
• Black Powder-Coated Steel Finish: Resists fingerprints and mild corrosion in controlled commercial environments. Not rated for outdoor exposure, direct sunlight, or humidity above 80% RH — salt spray and moisture will degrade the finish and internal circuitry over 12–24 months.

Deployment Considerations:

• Verify board models are Mercury or LNL revision before ordering. Older Gemini boards and custom variants use different connector pinouts — adapter harnesses exist but require lead time and add cost. Pull your BOM and cross-reference against Lifesafety Power's board compatibility matrix.
• The 20W integrated supply has zero headroom for power spikes or future expansion. If your design calls for solenoid strikes, magnetic locks, or high-current relay outputs, calculate total peak current (not average) and confirm against the PSU's short-duration rating. Undersizing here causes nuisance lock-ups and field callbacks.
• Mounting location must be climate-controlled (0–40°C ambient, non-condensing). Passive cooling assumes steady 15–25°C; sustained heat above 35°C will throttle the PSU and shorten component lifespan. Avoid mounting above ceiling-mounted fixtures or in uninsulated utility closets.
• Tamper switch wiring must be connected to an idle-supervised (normally open) alarm input on your access control panel. If your panel's alarm zone is normally closed (inverted logic), the tamper switch will report a continuous alarm when the enclosure is closed. Test the wiring before final installation.
• The 4.5-inch depth is shallow — no room for cable strain relief or secondary equipment (UPS, surge module, external PSU) mounted directly behind the backplate. Plan cable runs to enter from the side or bottom; use conduit to manage bundle density and avoid pinching.
• If you later exceed the 20W limit, external power can be supplied to the backplate studs without removing boards. However, this requires a separate 24V DC supply, additional wiring, and re-certification of the overall assembly. Plan the electrical infrastructure upfront to avoid rework.

The E4M1-BOXED is the right enclosure for cost-conscious single-door and two-door access control retrofits where space is tight and electrical infrastructure is already in place. It's not a universal solution — larger campuses, high-security facilities, or installations with redundancy requirements should evaluate full-size cabinets. For standard commercial tenant entry points and small secure storage areas, this enclosure cuts capex and labor meaningfully without sacrificing code compliance. Browse the Lifesafety Power catalog for compatible boards and auxiliary power supplies.