Description
Description
The BMZ-04R1-E is a compact, industrial-grade 4-channel relay output module designed for PLC signal amplification, control system interfacing, and automation projects requiring multiple relay outputs. Building on the success of our 2-channel version, this 4-channel model offers greater I/O density while maintaining the same professional features: a rugged plastic enclosure, standard 35mm DIN-rail mounting, and full optocoupler isolation.
Each of the four channels is equipped with a high-quality Songchuan SPDT relay, capable of switching loads up to 10A at 250V AC or 30V DC — sufficient for most industrial loads including solenoid valves, contactors, motors, lighting, and heating elements. The optocoupler isolation provides complete galvanic separation between the low-voltage control side (your PLC or microcontroller) and the high-voltage load side, protecting sensitive electronics from back EMF, voltage spikes, and ground loop noise.
The BMZ-04R1-E features wide input compatibility (3.3V to 5V) and accepts both NPN (sinking) and PNP (sourcing) control signals automatically. This makes it an ideal signal amplifier for 3.3V microcontrollers (ESP32, Raspberry Pi Pico, STM32), 5V systems (Arduino, 5V PLCs), and mixed-voltage environments.
Typical applications include CNC machine control, industrial automation panels, PLC output expansion, building management systems, and laboratory automation. The enclosed design and DIN-rail mounting make it suitable for professional control cabinet installation.
Features
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4 independent relay channels with optocoupler isolation
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High-quality Songchuan brand relays (SPDT changeover contacts)
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Wide control signal range: 3.3V – 5V DC (NPN and PNP compatible)
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Industrial plastic enclosure with 35mm DIN-rail mounting
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Galvanic isolation between control side and load side
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Screw terminals for all control inputs and load connections
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LED indicators per channel for relay status
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Compact 4-channel design for space-saving installation
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Tool-free DIN-rail clip for easy mounting and removal
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Rated for up to 10A resistive load per channel
Technical Parameters
| Parameter | Value |
|---|---|
| Number of Channels | 4 |
| Control Signal Voltage | 3.3V – 5V DC |
| Module Power Supply | 24V DC (typical industrial supply) |
| Input Compatibility | NPN (sinking) or PNP (sourcing) — auto-detecting |
| Relay Type | Songchuan SPDT (1 Form C) |
| Maximum Load Current | 10A (resistive load at 250V AC / 30V DC) |
| Optocoupler Isolation | Yes (galvanic isolation, ≥1500V) |
| Mounting | 35mm DIN-rail (top hat rail) |
| Dimensions | Approx. 95mm × 86mm × 40mm |
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