KEYPLUS Relay Output Base P403

Seamless Alarm Linkage. Automated Facility Protection.

KEYPLUS Hardwired Relay Output Base for Alarm Systems (P403)

The KEYPLUS P403 is a hardwired AC 220V–240V relay output base engineered for seamless emergency linkage across fire and security systems. Delivering a heavy-duty 250VAC 3A dry contact output with selectable NO/NC modes and a 10-year service life, it effortlessly bridges smoke and gas detectors to external sirens, ventilation dampers, and building management systems (BMS).

A Warning Without Action Leaves Properties Exposed.

When hazard detectors sound an alarm, automated mechanical intervention is critical:

• Isolated Hazard Detection: Audible buzzers warn occupants but fail to automatically shut down HVAC systems, allowing toxic smoke to spread across entire ventilation networks.
• Complex Relay Add-Ons: Installing separate control enclosures and auxiliary relays inflates installation costs, clutters ceiling aesthetics, and introduces wiring points of failure.
• Contact Incompatibility: Fixed single-mode controllers cannot adapt to diverse third-party input requirements (normally open vs. normally closed circuits).

Robust 250VAC/3A Dry Contact Switching

• Feature: Built-in industrial dry contact relay rated for loads up to 250VAC / 3A, with selectable Normally Open (NO) and Normally Closed (NC) options.
• Advantage: Provides complete electrical isolation between mains detector power and external control loops, allowing universal interfacing with BMS inputs, fire dampers, and emergency lighting.
• Benefit: Broad equipment compatibility. Integrators can trigger secondary exhaust fans, unlock magnetic access doors, or shut down industrial equipment instantly upon detector actuation.

Direct Ceiling Base Mounting Architecture

• Feature: Compact profile measuring Φ139 × 29 mm, serving as both the detector mounting base and the hardwired interface module.
• Advantage: Eliminates extra wall gang boxes and complex external relay modules. Cable routing and contact terminations are neatly concealed behind the twist-lock detector.
• Benefit: Substantial cost and labor savings. Streamlines multi-room deployments in hotels, dormitories, and commercial developments while maintaining an unobtrusive architectural ceiling aesthetic.

Low-Current Standby & Decade-Long Durability

• Feature: Highly optimized electrical design operating on AC 220V–240V (50/60Hz) with a quiescent standby current of under 50mA and a design life exceeding 10 years.
• Advantage: Draws negligible standby power and resists thermal aging under continuous 24/7 commercial power distribution.
• Benefit: Reliable, maintenance-free infrastructure. Guarantees fail-safe actuation during true emergencies without the threat of nuisance lockups or component wear.

Model Number	P403
Device Category	Relay Output Base / Relay Controller
Operating Voltage	AC 220V–240V, 50/60Hz
Quiescent Current	< 50 mA
Relay Rated Load	250VAC / 3A
Contact Mode	Selectable Normally Open (NO) / Normally Closed (NC) Dry Contact
Product Lifespan	> 10 years
Dimensions	Φ139 × 29 mm
Mounting Type	Ceiling Base Twist-Mount
Terminal Connections	Screw Terminals for Line, Neutral, Interconnect, and Relay Contacts
Alarm Linkage	Relay Output, Access Control Release, Siren Linkage, Damper Control