C‑TEC ActiV C4403B Fixed‑Temperature Heat Detector, 75°C Class B, 2‑Wire, EN54‑5 C4403B

Introduction to the C‑TEC ActiV C4403B Fixed‑Temperature Heat Detector

C‑TEC ActiV C4403B Fixed‑Temperature Heat Detector (75C)is a purpose‑built conventional heat detector designed for environments where smoke detection is unreliable or unsuitable. Certified to EN54‑5 and engineered for easy ceiling mounting, the C4403B provides dependable fixed‑temperature detection with clear 360 LED alarm indication. Its 2‑wire monitored wiring and compatibility with ActiV bases make it a straightforward choice for conventional fire alarm systems, plant rooms, kitchens and industrial spaces.

Key features at a glance

• Fixed‑temperature detection (Class B / High) with a nominal 75C response range (typical alarm approx. 69–85C).
• 2‑wire monitored, polarity sensitive design compatible with ActiV bases (C4408 series).
• Two ultra‑bright red LED strips arranged for full 360 visual alarm indication.
• Third‑party EN54‑5 certification (Intertek) and robust polycarbonate housing (UL94 V‑2). IP42 rated.
• Wide supply range (9–33 V DC) with low quiescent current for minimal loop loading.

Detailed specifications and practical benefits

The C4403B is a fixed‑temperature device classified as Class B (high). It triggers an alarm when ambient temperature reaches the detectors static response range, nominally 75C. In practice the detector typically alarms at around 69–85C depending on conditions. This makes it suitable for applications where a higher threshold is required to avoid nuisance alarms from normal process heat while still detecting genuine overheating or fire conditions.

• Supply voltage: 9–33 V DC — compatible with most conventional panels and monitored loops.
• Quiescent current: approximately 30 A at 24 V DC — low standby current reduces loop loading and allows more devices per circuit.
• Alarm current: varies with supply (approx. 19 mA at 12–33 V DC; 11 mA at 9 V DC) — efficient alarm signalling while keeping power draw moderate.
• Wiring: 2‑wire monitored and polarity sensitive; suitable for common conventional wiring practices when using compatible bases.

These electrical characteristics mean the detector is easy to integrate into existing conventional systems without large power demands. Low quiescent current is especially valuable on long runs or heavily populated loops.

• Housing: white polycarbonate with UL94 V‑2 rating and nylon parts for durability.
• IP rating: IP42 — protected against solid objects greater than 1 mm and downwards dripping water (suitable for typical indoor ceilings, plant rooms and kitchens; not intended for outdoor or highly exposed locations).
• LED indication: two ultra‑bright red strips (8  2 mm) arranged to give near 360 visibility for quick identification of alarm conditions from around the ceiling.
• Physical size: Ø102.2 mm diameter with 37 mm depth; weight approx. 99 g — compact ceiling profile that blends into many environments.

Together, these features offer a robust detector that is visible, compact and compatible with standard installation practices.

The C4403B is third‑party certified to EN54‑5 (Intertek), one of the key European standards for heat detectors. EN54‑5 certification provides assurance that the detector meets defined performance criteria and is appropriate for installations where compliance with EN standards is required. Installations should still follow local codes, EN54 guidance and the manufacturers datasheet and manual.

Use cases and scenarios where the C4403B excels

While smoke detectors are ideal for early fire detection in many settings, there are numerous environments in which fixed‑temperature heat detectors offer distinct advantages. The C4403B is particularly suitable for:

• Industrial areas with high ambient dust, airborne particles or process fumes where smoke detectors frequently produce nuisance alarms.
• Kitchens and cooking areas where smoke, steam and cooking aerosols would trigger optical detectors unnecessarily.
• Plant rooms, boiler houses and mechanical spaces with higher normal operating temperatures, where a higher thermal threshold avoids false alarms from routine operation.
• Workshops, manufacturing floors and storage areas with dusty or smoky processes where reliable heat‑based detection provides practical protection.

Because the C4403B has a nominal 75C threshold, it is well suited to environments that may experience moderate process heating but where a significant sustained temperature rise would indicate an emergency. The clear 360 LED indication aids rapid visual confirmation during routine inspections and maintenance.

Comparisons with similar products and alternative technologies

Fixed‑temperature detectors like the C4403B respond when a specific temperature is reached. Rate‑of‑rise detectors alarm when temperature increases rapidly over a short time. Rate‑of‑rise is better at detecting fast‑developing fires that have not yet reached a high absolute temperature, whereas fixed‑temperature detectors avoid false alarms in environments with frequent but slow temperature fluctuations. In dusty, greasy or smoky areas where smoke detectors are impractical, a fixed‑temperature Class B device offers reliable, simple behaviour.

Optical and ionisation smoke detectors provide earlier warning of smouldering fires in clean indoor environments, but they are prone to nuisance alarms in kitchens, dusty workshops and areas with aerosols or steam. Heat detectors like the C4403B are deliberately less sensitive to airborne contaminants and therefore more appropriate where smoke detection would be problematic. For comprehensive protection, many systems combine smoke and heat detectors in different zones according to risk.

The C4403B is a conventional (2‑wire monitored) device. Addressable detectors provide individual device identification, advanced diagnostics and easier fault location on large networks, which is advantageous in complex or large installations. Conventional detectors remain cost‑effective and reliable for small to medium installations, plant rooms or where simple zoning is sufficient. The C4403Bs low cost, simplicity and compatibility with common ActiV bases make it a practical option for many projects.

Customer feedback and installer insights

While there are no manufacturer‑published customer endorsements included here, installer and end‑user feedback in the field typically highlights several recurring benefits of the C4403B family:

• Reliability in challenging environments — installers report fewer nuisance alarms when replacing smoke detectors in dusty plant rooms with high‑threshold heat detectors.
• Clear visual alarm indication — the ultra‑bright 360 LEDs make it easy for maintenance staff to spot an alarmed unit during routine checks.
• Ease of integration — compatibility with ActiV bases and simple 2‑wire wiring reduces installation time on conventional panels.

Prospective buyers should consult case studies or speak with local C‑TEC distributors for project‑specific references and any published customer reviews.

Conclusion: Why the C‑TEC ActiV C4403B is a great choice

The C‑TEC ActiV C4403B Fixed‑Temperature Heat Detector (75C) is a focused, well‑specified solution for locations where smoke detection is impractical and a robust high‑threshold heat detector is required. Its EN54‑5 certification, low quiescent current, wide supply range and clear 360 LED indication combine to offer dependable performance, easy installation and simple maintenance. For conventional fire alarm systems protecting kitchens, plant rooms, boiler houses, workshops and other dusty or fume‑prone environments, the C4403B represents a cost‑effective, regulation‑friendly choice that balances sensitivity with resistance to nuisance alarms.

As with any safety device, correct siting, wiring and installation to the manufacturers instructions and local regulations are essential. When selected and installed appropriately, the C4403B provides a straightforward and reliable layer of detection in environments where heat‑based sensing is the preferred option.