QR Systems MR-4 addressable relay module
Four-channel addressable relay module: 4 dry-contact outputs with open and short-circuit line supervision, short-circuit isolator, powered from PLS, 1 address.
Specifications
- Type
- addressable relay module, four-channel
- Interface
- PLS (addressable loop)
- Address slots
- 1
- Outputs
- 4 dry contacts with open and short-circuit line supervision; built-in short-circuit isolator (disabled by default)
- Switching current
- 0.3 A at 250 V AC / 2 A at 30 V DC
- Power supply
- from the PLS loop
- Current consumption
- 0.2 mA standby / 28 mA maximum
- Operating temperature
- −10…+55 °C
- Protection rating
- IP20
- Dimensions
- 160×125×36 mm, up to 0.21 kg
Description
The QR Systems MR-4 relay module is a four-channel addressable device for integrating QR Systems fire automation with actuators. The module controls ShU-DU cabinets, ventilation systems and other equipment through four independent dry-contact outputs in one housing. Communication and power run over the PLS addressable loop, so no additional power cables need to be laid. The module supervises the lines to the actuators for open and short circuit, and the built-in short-circuit isolator keeps the PLS loop operational in case of a local fault. In the system the MR-4 occupies one address slot and has LED indication and a housing tamper switch. The short-circuit isolator is disabled by default and is enabled in the panel settings.
Advantages
- 4 independent dry-contact outputs in one housing — several devices controlled from one address
- Supervision of the dry-contact lines for open and short circuit — a fault in the circuit to the actuator is visible on the panel
- Built-in short-circuit isolator — a local short does not disable the whole PLS loop
- Switches 250 V AC / 30 V DC, 0.3 A at 250 V and 2 A at 30 V — suitable for cabinets and load relays
- Powered from the PLS loop, 0.2 mA in standby and 28 mA maximum — simple installation without a separate supply
- Tamper and LED indication — on-site monitoring of housing opening and module status
Applications
- Controlling ShU-DU cabinets of smoke exhaust fans
- Shutting down ventilation and controlling building systems in case of fire
- Locations with several actuators close to each other
- Integrating dry-contact process equipment into a QR Systems system
Frequently asked questions
How does the MR-4 differ from the MR-1?
How are the lines to the actuators supervised?
What are the operating and installation conditions?
Product reviews
Questions & answers
