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Comitronic-BTI COM3C 2NO+1NF Safety Relay - Bimanual Control


  • Two-hand control relay
  • Control of 2 buttons 1NO+1NC
  • Desynchronism between buttons : 4ms.
  • 2NO + 1NC output contacts
  • Test input (position switches, contactors)
  • DLC short-circuit monitoring
  • Plug-in terminals
  • 24Vac/dc supply
  • 22.5mm housing


The COM3C relay equipped with two push buttons gathers the same characteristics of a two hand control device from III C type. This relay is used to work on presses, the movement of which can be interrupted at any time during the cycle, such as the friction clutch presses, the hydraulic presses, bending machines, etc.

22.5mm wide case mountable on a 35mm symmetrical DIN rail according to DIN 50022. The tightening couple of the terminals is 0.5 Nm.

The maximum diameter of the wiring cable is 1.5mm². The wiring between the COM3C and the external elements (pushbuttons, e.g.) has to be performed with wires, whose isolation is dimensioned for a nominal voltage of 250V, even if the signal is only 24VDC. The safety device has to be installed in a cabinet or enclosure, which provide a protection degree of IP54 minimum.

Technical data :
Power supply : 24V AC/DC; -15%/+10%; 50/60 Hz
Current consumption : < 2W (DC); < 5VA (AC)
Safety outputs : 2 NO; 1 NC 8A/250V AC
Auxiliary output : DLC : Electronic current-limiting circuit-breaker
Switching power : > 50mW
Reaction time : < 20ms
Temperature operation : -20°C…+60°C
Protection class : IP20
MTTFd/DC : 120 years / 99,9%
B10d : AC1: 860000, AC15: 300000, DC13: 300000
Housing : Polycarbonate, yellow
Connection : Plug-in terminals
Dimensions (W x H x D) : 22,5 x 100 x 111mm
Weight : 178g
Standards : EN ISO13849-1, EN574 COM3C : Category III C as per EN574 and category 4 as per EN954-1.
Machine’s regulation : EN60204-1, EN292
Safety classification
Acc. to EN ISO 13849-1 : PLe
Certification : IIIC

Additional Information

Manufacturer Comitronic - BTI
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