Aiphone 3 Call Semi Flush Mount Master Station - LEF-3C

Aiphone LEF-3C Semi Flush Mount Master Station

Overview

The Aiphone LEF-3C is a 12V DC semi-flush mounted master station designed for small-to-medium commercial intercom systems where you need press-to-talk control at a central point with up to four responding substations. Built for installations where panel space or aesthetics matter — the recessed mount sits 1-3/8 inches deep — this unit handles simultaneous multi-station networks across distances up to 1,600 feet with the right gauge wire, making it viable for warehouses, office buildings, and facility management stations that don't require complex VMS integration.

Key Features

• 12V DC, 300mA power draw per station: Low current requirement means your power supply (PS-1208UL or PS-1225UL, sold separately) stays within budget and doesn't require oversized conduit runs. Perfect for retrofit jobs where adding dedicated circuits is expensive.
• Press-to-talk at master, hands-free at substations: The operator at the LEF-3C holds the talk button; responding stations receive and can speak back without pressing anything. This asymmetry works well in facilities where the master station user is managing multiple calls and doesn't want to toggle between button presses.
• Four-station capacity, intermixable: Mix and match Aiphone substations across your four talk paths without reconfiguration — you can deploy a combination of desk, wall-mounted, or panel-flush units depending on each location's needs.
• 5-wire trunk + individual station wires: Common wires (E, R, Y, +, -) carry power and control; each of up to four stations adds one individual wire looped or homerun. This architecture keeps cabling tidy and lets you isolate stations if one wiring run fails.
• 650 feet @ 22AWG; 1,600 feet @ 18AWG: Voltage drop over distance is the limiting factor — use heavier 18AWG wire for long runs (loading docks to distant warehouses) to keep audio crisp and power healthy at the far end. Budget-conscious installations use 22AWG within 650 feet without issue.
• 800mW reception / 500mW transmission @ 20Ω: Adequate audio output for typical small rooms and office cubicles; substations receive at higher power (800mW) so their speakers are louder, compensating for varied ambient noise across different station locations.

Integration & Compatibility

The LEF-3C operates as a standalone intercom system with no network connection, VMS integration, or IP requirements. It is a hardwired analog device, meaning it integrates only with other Aiphone LEF-series stations and does not connect to surveillance software, access control systems, or IP-based communication platforms. Power it from a Aiphone PS-1208UL (12V, 800mA) or PS-1225UL (for systems with BG-10C all-call modules). All wiring is conventional copper (E, R, Y, +, - trunk plus individual station drops) — no special network infrastructure needed.

Environmental and Installation Notes

Operating temperature range is 32–104°F (0–40°C), standard for indoor commercial facilities. The semi-flush form factor (8-1/4 inches H × 6-1/8 inches W × 1-3/8 inches D) fits standard wall cavities and sits nearly flush when recessed. This depth is shallow enough for retrofit into existing electrical boxes or lightweight framing without major patching. No IP or IK ratings apply — this is an indoor-only device. Position it where operators can reach the talk button and hear responding stations; don't install behind large obstacles or in high-ambient-noise areas (machinery floors) where audio clarity will suffer.

What's in the Box

Package contents not detailed in manufacturer specifications. Contact the manufacturer directly for a full bill of materials for this model.

Frequently Asked Questions

Q: Does the LEF-3C work as a standalone system, or does it need a master control unit?

A: The LEF-3C is the master station itself. It is the central point from which you initiate calls to up to four substations. No separate master control box is required — you wire substations back to the LEF-3C and operate directly from its button interface.

Q: Can I mix different Aiphone station models on the same LEF-3C system?

A: Yes. The LEF-3C supports up to four intermixable stations, meaning you can connect a combination of desk units, wall stations, or other Aiphone LEF-series substations in any configuration that totals four or fewer stations.

Q: What power supply do I need?

A: Use a Aiphone PS-1208UL (12V, 800mA) for standard systems, or a PS-1225UL (12V, 2.5A) if your system includes a BG-10C all-call module. The power supply is sold separately and must be ordered with the LEF-3C.

Q: How far can I run wiring from the LEF-3C to substations?

A: Maximum distance is 650 feet using 22AWG wire, or 1,600 feet using 18AWG wire. Voltage drop increases with distance, so longer runs require heavier gauge to maintain audio quality and power delivery at the far end.

Q: Is the LEF-3C outdoor-rated?

A: No. The LEF-3C is rated for indoor use only (0–40°C operating temperature). It has no IP or weatherproofing rating. For outdoor intercom, select outdoor-rated Aiphone substations paired with this indoor master.

Q: Does the LEF-3C integrate with IP cameras, VMS software, or access control systems?

A: No. The LEF-3C is a closed analog intercom system with no network connectivity or integration ports. It operates independently of surveillance, access control, and IP-based systems.

Jerry Tildsen

The LEF-3C is a workhorse for facilities that need simple multi-point intercom without the overhead of IP integration. I've deployed this unit in light manufacturing, office parks, and warehouse management stations where operators need to reach loading dock, security, or reception quickly without software licensing or network infrastructure. The press-to-talk mastery at the LEF-3C point-of-control keeps call flow intuitive — no fumbling with simultaneous button presses when managing multiple stations.

Technical Highlights:

• 12V, 300mA per station: Minuscule power budget means you can power multiple stations from a single supply rated 800mA (PS-1208UL) or 2.5A (PS-1225UL). No need for distributed power blocks or complex conditioning — a single wall-mounted supply handles the whole system, reducing install cost and failure points.
• 800mW @ 20Ω reception vs. 500mW transmission: The master receives louder than it transmits — intentional design that ensures responding stations hear the operator clearly even in moderate ambient noise. Transmission power is sufficient for quiet office environments but not for shouting over machinery; position accordingly.
• 1,600 feet @ 18AWG wiring distance: Critical for sprawling sites — if your dock is 1,200 feet from the management office, use 18AWG and you're within spec. Voltage drop is the enemy here; cut corners on wire gauge and audio quality degrades visibly (stations sound thin, operators miss critical audio cues).

Deployment Considerations:

• The semi-flush mount (1-3/8 inches deep) requires a cavity or recess; surface mounting on drywall requires a retrofit box. Budget installation time for patching if you're adding this to an existing wall.
• No all-call capability without the optional BG-10C module — if your facility needs one-to-many broadcast (e.g.,