Hochiki CHQ-MRC2 ESP Addressable Mains Relay Controller | Integral Short-Circuit Isolator
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Key features
- Mains-rated relay: 250 VAC 5 A, 48 VDC 2 A
- DIN rail housing with built-in isolator
- DIL switch addressing plus monitored input
Downloads
Summary
The Hochiki CHQ-MRC2/DIN(SCI) is a single loop input/output module built to mount directly onto standard DIN rail, saving you from fitting a separate backbox where panel or cabinet space is already set up for DIN-mounted gear. It gives you a single mains-rated relay output for switching dampers, access control equipment such as door magnets, extractors, or plant and equipment shutdown circuits, plus an auxiliary monitored input for local power supply fault monitoring or general-purpose use.
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For installers working inside existing control cabinets or panel builds, that DIN rail form factor means fewer fixings, less enclosure cutting and a tidier cable run on site. You get a compact green ABS unit with an integral short-circuit isolator built in, so a fault on one device doesn’t take out the rest of the loop.
Addressing is handled with simple DIL switches rather than software, so you can set the loop address on the bench before you even reach site. Pair it with a compatible fire alarm control panel and you’ve got a straightforward way to bring mains-rated switching into a BS 5839-1 system without adding a separate interface box.
Features
- DIN rail mounting – fits directly into existing control cabinets without a separate backbox
- Mains-rated relay contact – switches dampers, door magnets, extractors or plant shutdown at 250 VAC 5 A or 48 VDC 2 A
- Auxiliary monitored input – use for local power supply fault monitoring or as a general-purpose input with a 10 kΩ end-of-line (EOL) resistor
- Integral short-circuit isolator – limits the effect of a wiring fault to a single section of the loop
- DIL switch addressing – set the loop address on the bench with simple dual in-line (DIL) switches, no programming tool needed
- Compliance – suitable for BS 7273-4 applications
Specifications
| Ordering Code | CHQ-MRC2/DIN(SCI) – DIN Module |
|---|---|
| Operating Voltage | 17 – 41 VDC |
| Low Power Mode (0.75s) | 100 μA |
| Quiescent Current (Typ) | 300 μA |
| Current Consumption | 22 mA ± 20% (polling) |
| Current In Short Circuit | 8 mA |
| Maximum Short Circuit Current | 1 A |
| Relay Contact Rating | 48 VDC max, 2 A (resistive load); 250 VAC max, 5 A (resistive load). For mains ac switching, the control panel must comply with the Low Voltage Directive for SELV circuits |
| Input EOL Resistor | 10 kΩ, ±5%, 0.25 W |
| Input Threshold Level | ON = 470 Ω, short circuit <50 Ω, open circuit >100 kΩ |
| Storage Temperature Range | -30°C to +60°C |
| Operating Temperature Range | -10°C to +50°C |
| Maximum Humidity | 95% RH non-condensing (at 40°C) |
| Weight | 145 g |
| Dimensions | L119 x H108 x D24 mm |
| Colour / Material | Green ABS (DIN module) |
| Fusing | No fuses fitted – relay output circuit requires external over-current protection |
| Compliance | Suitable for BS 7273-4 applications |
FAQ
No. The CHQ-MRC2/DIN(SCI) is housed in a green ABS enclosure designed to clip straight onto standard DIN rail, so it’s suited to fitting inside an existing control cabinet or panel rather than as a standalone wall-mounted unit. No fuses are fitted on this device. You need to protect the relay output circuit with a suitable external over-current protection device sized to the relay contact rating to prevent excessive current through the contacts. Yes, the unit is suitable for BS 7273-4 applications, and the relay output can be used to control access control equipment such as door magnets. Confirm compatibility with your fire alarm control panel and check it meets the Low Voltage Directive for SELV circuits if you’re switching mains loads. The datasheet states the relay contact state is indeterminate until the unit is powered, so plan commissioning and any fail-safe wiring with that in mind rather than assuming a default open or closed position. Addressing is done with on-board DIL (dual in-line) switches rather than software, so you can set the address before installation and avoid needing a separate addressing tool on site. The auxiliary input is designed for local power supply fault monitoring or as a general-purpose monitored input, using a 10 kΩ end-of-line (EOL) resistor with ON, short circuit and open circuit thresholds defined in the specification.Does this need a separate backbox to mount it?
Is the relay output fused?
Can I use this for door holder release under BS 7273-4?
What state are the relay contacts in before the unit is powered up?
How do I set the loop address?
What can I connect to the monitored input?
Downloads
- Datasheet (Adobe PDF)
Additional information
| Weight | 0.1 kg |
|---|---|
| Dimensions | N/A |
| Version | DIN Rail, Standard |
| Device Type | |
| Environment | |
| Protocol | |
| System Type | |
| Output Rating | Mains |
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