CAST CA734 Mini I/O Unit View larger

CAST Mini I/O Unit



  • Certified to EN54-17 & 18 by the LPCB.
  • Includes a switch monitor, signal relay and onboard loop isolator.
  • Can be used as an interface to third-party MCPs by offering a monitored input and LED output.
  • 7mA Alarm Current.
  • Four plastic tabs for surface or panel mounting.
  • Includes a 1A 30V DC volt-free changeover relay. Can also switch 0.3A @125Vac.
  • 7 way ribbon connector offers Switch +Ve and –Ve, LED +Ve and –Ve and relay (NC/C/NO) connections
  • Future header pin offers expansion opportunities for peripheral I/O devices (such as Hush2)


More details

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More Information

'CAST' is the world’s most-advanced 'distributed intelligence’ fire alarm system protocol. Conceived, designed and realised by C-TEC as part of a five-year, multi-million pound project, it involved the creation of a powerful proprietary communication protocol (C-TEC Addressable System Technology, CAST) and multiple control panels & field devices. Now available to purchase, its key features include:

• 255 devices per loop.
• Autonomous decision-making for faster response times.
• Multiple type codes.
• 40V loop drive voltage.
• Two ‘soft’ addressing options – automatic via the panel or manual via a powerful handheld programmer.
• Powerful multi-level addressing facilitates easy device addition and swapped device identification.
• Multiple functionality at a single address (integrated devices) - due 2019.
• Volumes, tones & detector modes can be changed at compatible panels.
• High-speed data transmission and robust data transfer.
• Intrinsically EN54-13 compliant.
• Provides geographical location of short and open circuit faults (a short circuit isolator is included as standard in every CAST field device).
• Replace device function.
• Future seamless integration with other CAST life safety systems reducing energy, servicing, installation and repair costs.
• Designed and manufactured in the UK.

Technical Specifications

Approvals/certificationsCertified to EN54-17/18 by the LPCB.
CompatibilityCompatible with C-TEC's XFP/ZFP CAST Addressable Fire Panels.
Supply/operating voltage27 to 40V DC.
Quiescent current1.1mA.
Activation current7mA.
Auxiliary relaysOne volt-free single pole changeover relay rated at 1A @ 30 VDC (or 0.3A @ 125 VAC). Non-monitored. Clean contact.
Auxiliary inputsOne monitored input that can be set to operate as: (1) a single zone monitor to support up to 20 ActiV detectors and 10 MCPs or (2) a monitored normally-open switch, triggered by a 470R.
IndicatorsSingle Red (Relay Active & Polling); Single Yellow (Monitored Input Fault).
Product dimensions (mm)65 W x 65H x 20 D mm (excluding terminal block & ribbon cable). Ribbon cable is 150 mm length.
Construction & finishClear ABS polycarbonate enclosure.
IP RatingIP40.
Operating conditions/temperature-10ºC to +55ºC.



3 other products in the same category:

Approval Certificates

Approval Certificate (LPCB)


EC Certificate of Conformity (CPR)


Declaration of Performance (C-TEC)


Declaration of Conformity (C-TEC)


EN54-13(2017) System Certificate