Apollo Series 65 45681-248APO End-of-Line Relay Base (24V)

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The Apollo Series 65 45681-248APO End-of-Line Relay Base (24V) is a specialized conventional mounting base featuring an integrated 24V DC relay circuit. Engineered for 4-wire conventional fire alarm systems, it provides end-of-line power supervision and local output switching upon detector activation.

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Category: Fire Devices Accessories & Bases

Brand: Apollo

Description

The Apollo Series 65 45681-248APO End-of-Line Relay Base (24V) is engineered to maintain safety integrity and simplify interface design across commercial, industrial, and security-integrated fire detection systems. Intended for placement at the end of a detector zone circuit in 4-wire installations, this base contains a built-in relay energized by the 24V DC supply. If auxiliary power is lost or the detector initiates an alarm state, the internal relay changes state to trigger local auxiliary control functions—such as door holders, ventilation shut-offs, or security system inputs—while continuously monitoring power continuity across the zone circuit.

Features

Integrated 24V DC end-of-line relay provides dependable power supervision and fault signal initiation on 4-wire systems
Single Pole Double Throw (SPDT) relay contacts enable direct switching of auxiliary systems like fire doors, dampers, or intruder panels
Wide voltage capability and robust terminal block layout ensure seamless compatibility with standard conventional control panels
High-grade white polycarbonate construction matches all Apollo Series 65 optical, ionisation, and heat detector heads
Base-retained relay functionality ensures auxiliary system integration remains active regardless of head removal

Specifications

Brand: Apollo Fire Detectors
Series: Series 65
Model/Part Number: 45681-248APO
Product Type: End-of-Line (EOL) Relay Mounting Base
Operating Voltage: 9V DC to 33V DC (Nominal 24V DC for EOL relay circuit)
Relay Contact Rating: 1A at 30V DC / 0.5A at 125V AC (Single Pole Double Throw / SPDT)
Wiring Configuration: 4-Wire Conventional System
Material: White Polycarbonate Housing
Terminals: Stainless Steel Screw Terminals with Line Integrity Contacts
Operating Temperature: -20°C to +60°C
Humidity Range: 0% to 95% RH (non-condensing)
Dimensions: 100 mm (Diameter) x 8 mm (Height)
Standards & Certification: LPCB Approved, CE Marked, EN 54-7 Compliant (when fitted with approved detector)

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