Viking Electronics E40BK Textured Black Entry Phone with Automatic Disconnect

Overview

The Viking Electronics E40BK is a telephone-line-powered analog entry phone built for commercial doors, vestibules, and gated access points where you need two-way voice communication without running a separate power circuit. At 72mm x 46mm x 42mm behind an 18-gauge 304 stainless steel faceplate, it drops into a standard single-gang rough-in box or attaches to any flat surface — no dedicated power supply, no data wiring, no network configuration. If your site runs POTS or a PABX with an analog extension, the E40BK is wired and working in under an hour.

This is a Viking Electronics entry phone built around the reality of analog telephony infrastructure: facilities that maintain POTS lines for elevator phones, fire panels, or ADA-compliant voice stations already have the infrastructure this phone needs. It draws a minimum of 20mA loop current at 18V DC from the telephone line itself — no wall wart, no PoE injector, no UPS to size.

Key Features

• Telephone Line Powered (18V DC, 20mA minimum): The E40BK draws its operating power directly from the telephone line, requiring 18V DC and at least 20mA loop current. That means zero additional power infrastructure at the door — one two-conductor pair handles both power and audio. For retrofit installs in existing buildings where running AC or low-voltage power to the door frame is a code or budget obstacle, this is the spec that makes the project feasible.
• Operating Temperature -30°F to 150°F (-34°C to 65°C): That 180-degree spread covers unheated vestibules in northern climates and sun-exposed south-facing walls in the southwest. Most commercial entry phones are rated to -4°F at best; the E40BK's lower bound is meaningful if you're spec'ing for outdoor use in Minnesota or Wisconsin winters without a heated enclosure.
• IP67-Rated 316 Stainless Steel Push Button: The call button is 316 stainless — the marine-grade alloy — and rated IP67, meaning it can be fully submerged briefly and still function. In a practical entry phone deployment that translates to reliable operation through pressure washing, heavy rain, and humid environments without button corrosion or water ingress at the actuator.
• 18-Gauge 304 Stainless Steel Faceplate (4.875" x 3.125" x 0.18"): The faceplate is thicker-gauge stainless than typical entry phone cosmetic panels, which matters in high-traffic or vandal-prone locations. At 0.18" thick it resists flex and denting from blunt contact — a bus depot or correctional facility lobby is a different environment than a quiet office vestibule.
• 62dB Speaker @ 1m: Measured at one meter, 62dB is audible in normal ambient environments but will get lost in a noisy loading dock or loud manufacturing floor. For quiet lobbies, retail entries, and residential access points, it is adequate. If you're spec'ing for high-noise environments, evaluate whether a supplemental alerting device is warranted.
• 300ms CPC Automatic Disconnect: When the called party hangs up, the phone generates a 300ms minimum CPC (Calling Party Control) signal that disconnects the entry phone circuit cleanly. This prevents the door station from staying off-hook and blocking the line — essential in multi-extension PABX environments where line seizing would prevent other calls.
• REN 0.8A: With a Ringer Equivalence Number of 0.8, the E40BK draws a predictable load on the ring circuit. Most PABX analog ports support up to REN 2.0–3.0, so you have headroom for the entry phone plus one or two additional devices on the same analog extension if needed.
• Flush or Surface Mount: The unit flush-mounts into a single-gang rough-in box (minimum 2.25" deep x 3.65" wide x 2.84" tall) or surface-mounts with an optional VE-3x5 surface mount box. Surface mounting avoids wall demolition in finished spaces and makes sense for retrofit installs where cutting into tile or concrete is not an option.
• 25V AC RMS Minimum Ring Voltage: The E40BK rings on standard 25V AC RMS from a PABX port, which is the typical analog extension ring signal. This rules out use with some VoIP ATAs that generate lower ring voltages — verify your ATA's ring output voltage before spec'ing this phone on a VoIP-to-analog conversion setup.
• Humidity Range 5% to 95% Non-Condensing: Covers virtually all indoor and sheltered outdoor environments. The non-condensing caveat means you should not mount this in a location subject to repeated freeze-thaw condensation cycles without a protective housing — a direct-outdoor mount in humid climates with no overhang could challenge that limit over time.

Integration and Compatibility

The E40BK integrates with any analog telephone system that delivers 18V DC minimum loop current and 25V AC RMS ring voltage — this includes most access control systems with PABX integration, traditional POTS lines, and analog station ports on hybrid or legacy PBX systems. For VoIP environments, an FXS ATA (Analog Telephone Adapter) with sufficient ring voltage output can bridge the E40BK to a SIP extension. Viking's E-10 and E-20 series cover SIP-native deployments if you need direct VoIP integration without an ATA intermediary.

The single-gang form factor aligns with standard North American electrical rough-in boxes, making it a natural fit for new construction and retrofit. For surface-mount installations, pair the E40BK with the optional VE-3x5 surface mount box from the same product family. When evaluating entry phone options for access-controlled doors, note that the E40BK provides two-way audio only — door release relay control requires an upstream PABX feature (e.g., DTMF-activated relay) or a separate door release module; the E40BK itself does not include an onboard relay.

For deployments that need a structured PoE-based infrastructure, review the PoE switch selection guides and Viking's IP-based E-series (E-10/20/30-IP) which add SIP registration, relay contacts, and network management — but require IP infrastructure the E40BK deliberately avoids.

Frequently Asked Questions

Q: Does the E40BK require external power?

A: No. The E40BK is telephone line powered, drawing a minimum of 18V DC at 20mA loop current directly from the analog phone line. No separate power supply or PoE connection is needed.

Q: What type of electrical box does the E40BK flush-mount into?

A: It requires a standard single-gang rough-in box with minimum inside dimensions of 2.25" deep x 3.65" wide x 2.84" tall. For surface mounting, the optional Viking VE-3x5 surface mount box is compatible.

Q: Will the E40BK work with a VoIP phone system?

A: It can work with VoIP systems via an FXS ATA (Analog Telephone Adapter) provided the ATA delivers at least 18V DC loop current and 25V AC RMS ring voltage. Verify your ATA's ring output spec before deploying. For native SIP entry phones, Viking's E-10/E-20/E-30-IP series are purpose-built for IP infrastructure.

Q: What is the operating temperature range of the E40BK?

A: -30°F to 150°F (-34°C to 65°C), making it suitable for unheated outdoor vestibules and exposed installations in extreme cold climates.

Q: Does the E40BK include a door release relay?

A: No. The E40BK provides two-way audio communication only. Door release requires a DTMF-activated relay feature on the connected PABX or a separate door release module.

Q: What is the push button rating on the E40BK?

A: The call button is 316 stainless steel rated to IP67 — fully dust-tight and can withstand brief submersion, which means it handles pressure washing and heavy rain without failure.

Karl Wilson

The E40BK's telephone-line-powered design is the right answer for a specific and common problem: you need a hardened entry phone at a door where running additional power is expensive or code-complicated, and the building already has analog telephone infrastructure. I deploy this model specifically in scenarios where the alternative — pulling a new low-voltage power circuit to the door frame — adds $400–800 in labor before the phone even goes in. The 18V DC, 20mA loop-current spec means your analog PBX extension or POTS line does double duty.

Technical Highlights:

• -30°F cold floor: That lower temperature limit is genuinely useful — most competing entry phones stop at 0°F or higher. For unheated parking garage pedestals or northern-climate outdoor vestibules without heat trace, the E40BK handles winters that would strand a lesser unit.
• IP67 316 stainless button: The call actuator is marine-grade stainless rated for submersion, not just splash. In a school, hospital, or correctional environment where the door station gets scrubbed with disinfectant sprays or pressure-washed periodically, that rating means the button survives the cleaning schedule.
• 300ms CPC auto-disconnect: Clean line release on hang-up matters on a PABX where a seized analog port blocks other calls. The 300ms CPC signal ensures the entry phone goes on-hook reliably when the receptionist or guard station ends the call — no phantom off-hook conditions on your analog extension card.

Deployment Considerations:

• Verify your PBX analog port or ATA delivers at least 25V AC RMS ring voltage. Some budget ATAs output 20–22V AC on ring — below the E40BK's 25V minimum — and the phone will fail to ring without presenting an obvious fault. Test ring voltage at the termination block before you close the wall.
• The 62dB speaker output is adequate for quiet lobbies but will be marginal in any space with HVAC noise above 55 dB ambient. If your vestibule or access point has mechanical room proximity or active HVAC discharge nearby, measure ambient before spec'ing — you may need a supplemental alerting device or a different unit with higher output.

The E40BK is the right fit for healthcare facility side entrances, multi-tenant building vestibules, and school secure-entry points where existing analog infrastructure is in place and power at the door is not. It is not the right tool for a greenfield IP deployment or any site migrating off analog in the next 18 months — for those, spec Viking's SIP-based E-series instead.