ActiV Diode Detector Base C4408D — Schottky Diode, 2‑Wire, IP42

Introduction to the C4408D ActiV Diode Detector Base and its key features

The C‑TEC C4408D ActiV Diode Detector Base is a purpose‑built mounting base for the ActiV family of conventional fire detectors, engineered to combine practical installation features with the electrical functionality often required on modern fire detection circuits. Low profile and simple to install, the C4408D includes an integrated Schottky diode for head‑out (active end‑of‑line) monitoring, remote LED terminals for optional indication, and is third‑party certified to the relevant parts of EN54 when used with ActiV detectors.

Its design focuses on reliability and ease of use for installers and system designers: click‑and‑twist mounting, an integrated head‑locking mechanism and ID tag, terminals sized for common fire‑rated cable, and an IP42 rating suitable for typical ceiling environments. In short, the C4408D is a compact, capable base that bridges the practical needs of on‑site installation with the electrical monitoring demands of conventional fire systems.

• Integrated Schottky diodebetween +V in and +V out to support head‑out/active EOL monitoring.
• Compatibilitywith the full C‑TEC ActiV detector range.
• Remote LED terminalsfor optional indicators; supports 360° LED visibility when used with ActiV heads.
• Click‑and‑twist mountingwith head‑locking and ID tag plus a head‑removal tool feature for rapid maintenance.
• Terminalsaccept fire‑rated cable commonly up to 2.5 mm²; designed for 2‑wire monitored, polarity sensitive wiring.
• Low profile and IP42rating for ceiling mounting in any orientation.

Detailed specifications and benefits

Understanding the C4408D’s specifications helps demonstrate why it is a practical choice for many conventional fire detection projects. Below are the principal technical and physical characteristics, followed by the benefits they deliver.

• Model:C4408D
• Product type:ActiV diode detector base
• Manufacturer:C‑TEC
• Compatibility:Full C‑TEC ActiV detector range
• Weight:≈ 55 g
• Diameter:≈ 102.2 mm
• Depth:≈ 20.5 mm
• Mounting:Click‑and‑twist ceiling mount (any orientation)

Benefit: The compact footprint (≈102 mm diameter and ≈20.5 mm depth) and low weight make the C4408D easy to handle and discreet once installed. Click‑and‑twist mounting reduces installation time and the integrated head‑locking and ID tag simplify maintenance and asset tracking.

• Wiring:2‑wire monitored, polarity sensitive
• Terminals:Accepts up to 2.5 mm² (fire‑rated cable)
• Diode:Integrated Schottky diode between +V in and +V out

Benefit: The integrated Schottky diode provides low forward voltage drop and robust performance for head‑out (active EOL) monitoring without needing separate diode modules or modifications to detector heads. Terminals sized for up to 2.5 mm² mean installers can use common fire‑rated wiring with confidence, and the polarity‑sensitive 2‑wire design aligns with standard conventional detection circuits.

• EN54:Third‑party certified to relevant parts of EN54 when used with ActiV detectors
• IP rating:IP42

Benefit: EN54 certification (in combination with ActiV detectors) provides reassurance about declared performance in applicable system configurations. IP42 protects against typical ingress concerns in ceiling spaces and internal building applications.

Use cases and scenarios where the C4408D excels

The C4408D is suited to a range of conventional fire detection installations. Typical scenarios include:

• Upgrades to existing conventional systems:Where an installer needs to add monitored end‑of‑line functionality without redesigning the circuit, the integrated Schottky diode simplifies implementation of head‑out monitoring schemes.
• Commercial and public buildings:Low profile and 360° LED capability with ActiV heads make it ideal for offices, retail spaces, schools and community buildings where aesthetics and unobtrusive indication are valued.
• Projects requiring quick installation and maintenance:Click‑and‑twist mounting and head‑locking reduce on‑site labour time and support straightforward servicing procedures, particularly in multi‑detector zones.
• Situations requiring clear remote indication:Remote LED terminals enable visibility at remote panels or local mimic displays—useful in plant rooms, corridors or control rooms where local remote indication assists staff and responders.
• Installations demanding reliable diode behaviour:The Schottky diode’s lower forward voltage drop and stable characteristics improve detection reliability in head‑out monitoring arrangements compared to some generic diode approaches.

Comparisons with similar products in the market

When evaluating detector bases, installers typically compare integrated diode bases, passive bases and bases requiring separate modules. The C4408D sits in the integrated diode category, and its advantages and trade‑offs are described below.

• Space and wiring:An integrated diode saves space in ceiling voids and reduces extra wiring and components compared with separate diode modules mounted in junction boxes.
• Installation speed:Integrated wiring points mean fewer connection steps and lower chance of wiring errors, speeding up commissioning.
• Serviceability:Integrated designs are simpler overall, though separate modules can be replaced independently if damaged. The C4408D’s head‑removal feature helps with maintenance.

• Performance:Schottky diodes have lower forward voltage drop, which reduces impact on supply voltage and can improve the margin for detector signalling compared with standard silicon diodes.
• Reliability:Lower thermal stress and efficient conduction characteristics make Schottky diodes a robust choice for monitored circuits.

• Functionality:The C4408D adds active monitoring and optional remote indication features missing from plain bases, making it more suitable for systems that require head‑out monitoring or remote status LEDs.
• Cost vs capability:There is a small premium for the added electronics and remote LED facility, but this is often offset by savings in reduced ancillary components and faster installation.

Customer feedback and typical installer comments

Formal published customer testimonials specific to the C4408D are limited in the public domain. However, common themes reported by installers and technicians who use integrated diode bases (and ActiV family components) include:

• "Installation is quick and predictable—the click‑and‑twist base really speeds up multiple detector installations."
• "Having the diode in the base removes the need for extra parts in the ceiling void—fewer junction boxes and tidier wiring."
• "The remote LED option is handy for complicated layouts where visual indication must be visible from multiple locations."
• "Compatibility and EN54 certification with the ActiV heads give peace of mind for spec compliance on projects."

These representative comments reflect common installer priorities: speed, neatness, and reliable monitoring. For project‑specific reviews, consult local installer case studies or reach out to C‑TEC partners for references on comparable installations.

Conclusion: why the C4408D is a strong choice

The C‑TEC C4408D ActiV Diode Detector Base is a compact, practical solution for conventional fire detection schemes that require head‑out/active end‑of‑line monitoring and optional remote indication. Its integrated Schottky diode simplifies wiring and reduces the need for additional modules, while the click‑and‑twist mounting, head‑locking, and ID tag make everyday installation and maintenance more efficient for technicians.

Combined with compatibility across the full ActiV detector range and third‑party EN54 certification when used in the specified configurations, the C4408D balances regulatory confidence with installer‑friendly design. For projects where neatness, monitored circuit behaviour and straightforward servicing matter, the C4408D is a versatile and cost‑effective base that helps reduce on‑site complexity and speeds up commissioning.

If you are specifying conventional detection equipment, the C4408D is worth considering for new installations, refurbishments or system upgrades. As always, ensure installation is carried out by a competent technician and consult the C4408/C4408D installation sheet and the ActiV detector datasheets for wiring diagrams, declared performance and detailed mounting instructions.