The OMRON NV4W-MR21 is a next-generation safety relay module engineered for critical automation and safety circuits. Designed by OMRON Automation and Safety, this 4-pole unit delivers exceptional reliability in emergency stop, light curtain, and interlock applications. The NV4W-MR21 features a wide-range MR coil that accepts both AC and DC control voltages, simplifying inventory and installation. With its robust contact rating, built-in surge protection, and clear LED status indicators, it ensures seamless integration into PLC-based systems and safety relays. Whether deployed in manufacturing lines, packaging machinery, or robotic cells, the NV4W-MR21 provides fail-safe operation and long service life.
| Parameter |
Specification for NV4W-MR21 |
| Product Type |
Safety Relay Module (4-Pole) |
| Model |
NV4W-MR21 |
| Coil Voltage (MR Type) |
24 to 240 VAC / 24 to 125 VDC (Multi-Range) |
| Contact Configuration |
4 Normally Open (NO) + 1 Normally Closed (NC) auxiliary |
| Contact Rating (Resistive) |
10 A at 250 VAC / 10 A at 30 VDC |
| Maximum Switching Voltage |
250 VAC / 125 VDC |
| Mechanical Life |
20,000,000 operations minimum |
| Electrical Life |
100,000 operations at rated load |
| Response Time (Pick-up) |
≤ 20 ms |
| Response Time (Drop-out) |
≤ 10 ms |
| Surge Protection |
Built-in varistor and RC snubber |
| LED Indication |
Green for coil energized; Red for fault (optional) |
| Mounting |
DIN rail (35 mm) or panel mount via screw terminals |
| Operating Temperature |
-25°C to +55°C (-13°F to 131°F) |
| Storage Temperature |
-40°C to +85°C (-40°F to 185°F) |
| Protection Rating |
IP20 (enclosed) |
| Safety Standards |
EN 60947-5-1, UL 508, CSA C22.2 No. 14, CE marked |
| Terminal Type |
Push-in spring clamp (compatible with 0.5 to 2.5 mm² wire) |
| Dimensions (H x W x D) |
87 x 22.5 x 99 mm (3.43 x 0.89 x 3.90 inches) |
| Weight |
Approx. 85 g (3.0 oz) |
What Does Our Clients Say
Mitsubishi MR-J4
Laura Navas
Great product!
2019/12/01
Keyence sensor
EQDR SALES
Original and fast!
2020/02/22