Eaton BWEXTR24V | BiWire Ultra External Relay Module | 24V Output, IP66 Weatherproof

FAQs

What voltage equipment can the BWEXTR24V switch?

The BWEXTR24V is exclusively designed for switching 24V DC loads only, with contacts rated at 1A @ 24VDC. This module is specifically intended for low voltage auxiliary equipment commonly found in fire safety installations including 24V electromagnetic door holders, 24V fire damper actuators, 24V control relays, 24V access control interfaces and other extra low voltage equipment. The BWEXTR24V must never be used to switch mains voltage (230V AC) loads as it lacks the appropriate contact ratings and safety certifications for mains voltage applications. For mains voltage switching requirements, installers must specify the BWEXTR230V variant which features contacts rated at 3A @ 230VAC. Using the incorrect relay module for the voltage application could result in contact failure, equipment damage and fire safety system malfunction.

How much current does the BWEXTR24V draw from the BiWire Ultra loop?

The BWEXTR24V draws exceptionally low current from the BiWire Ultra detection loop, consuming just 130µA (microamps) nominal under quiescent (normal monitoring) conditions and 200µA nominal during alarm conditions. These ultra-low current draws ensure the relay module has minimal impact on overall loop loading calculations, allowing multiple BWEXTR24V modules to be installed across BiWire Ultra zones without significantly affecting the number of detectors and other devices that can be accommodated on the system. The module operates from loop voltage between 18V-22V under normal conditions and 30.7V-32.4V during alarm, drawing power directly from the BiWire Ultra zone wiring without requiring separate power supplies. This efficient current consumption contributes to simplified installation and reduced system complexity compared to powered relay solutions.

Will the BWEXTR24V operate if a fire occurs on a different zone?

Yes, a key characteristic of BiWire Ultra External Relay Modules is that the relay contacts will operate if any zone on the entire BiWire Ultra system receives a fire signal, even if the relay is physically connected to a different zone to the one that is triggered. This means if the BWEXTR24V is connected to Zone 2, but a fire detector activates on Zone 1, Zone 3 or any other zone on the panel, the BWEXTR24V relay contacts will still operate. This system-wide operation ensures that auxiliary equipment such as electromagnetic door holders release throughout the entire building when fire is detected anywhere on the system, providing comprehensive fire safety response regardless of fire location. Installers must consider this global operation characteristic during system design to ensure appropriate auxiliary equipment response aligns with fire safety strategy and building evacuation requirements.

What applications are suitable for the BWEXTR24V?

The BWEXTR24V is ideal for controlling 24V DC auxiliary equipment in fire alarm installations where low voltage switching is specified. Common applications include 24V electromagnetic door holders (fire door retainers) which must release on fire alarm to allow fire doors to close automatically, 24V motorised fire damper actuators requiring closure signals during fire conditions, 24V relay interfaces for building management system integration, 24V access control system interfaces requiring fire alarm override functionality, 24V magnetic locks requiring release on evacuation, and 24V plant shutdown controllers for HVAC systems. The module is particularly valuable in installations where multiple auxiliary devices are distributed throughout the building, as each device can have a local BWEXTR24V connected to the nearest detection zone rather than requiring individual cables back to the main fire alarm panel, significantly reducing installation time and cable costs.

Can the BWEXTR24V be installed outdoors?

Yes, the BWEXTR24V features an IP66-rated weatherproof enclosure providing excellent protection against dust ingress and powerful water jets, making it suitable for outdoor installations as well as demanding indoor environments. The IP66 rating ensures the internal electronics are protected from rain, snow, dust and physical impact when properly installed with appropriately sealed cable glands. The module operates reliably across a wide temperature range from -10°C to +55°C, accommodating outdoor temperature variations in most climates, whilst humidity tolerance extends to 93% RH non-condensing for operation in damp conditions. However, installers should ensure the enclosure is mounted in an orientation that prevents water pooling on the lid, cable glands are correctly sized and tightened to maintain IP66 integrity, and the installation location provides some weather protection where possible to maximize long-term reliability in harsh outdoor environments.

Does the BWEXTR24V require any maintenance?

No, the BWEXTR24V has no serviceable parts and therefore no maintenance procedures apply. The module is designed as a sealed maintenance-free unit with the relay mechanism, PCB and all electronic components protected within the IP66 enclosure. There are no user-replaceable components, batteries to change, filters to clean or periodic servicing requirements. The relay is designed for long-term reliable operation without intervention, with the robust construction ensuring consistent performance throughout the system’s operational lifetime. During routine fire alarm system testing and inspection, the relay operation should be verified by triggering fire conditions and confirming the connected 24V auxiliary equipment responds correctly (for example, electromagnetic door holders releasing), but the BWEXTR24V module itself requires no direct maintenance attention. This maintenance-free design reduces whole-life costs and ensures consistent fire safety system performance.