Omron D4NL-4CFG-B Guard-Lock Safety Door Switch
SKU: D4NL-4CFG-BUSD 55.00
Omron D4NL-4CFG-B power-to-lock guard switch with 24 VDC solenoid, 2NC door contacts, 1NC/1NO lock monitor, 1300 N holding force and M20 conduit entries.
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Product Overview
The Omron D4NL-4CFG-B is a key-operated D4NL guard-lock safety-door switch with a plastic housing and head. It uses power-to-lock logic: the 24 VDC solenoid must be energised to lock, and loss of solenoid power releases the lock.
The contact arrangement is 2NC for door monitoring plus 1NC/1NO for lock monitoring, with slow-action operation. The switch provides 1300 N holding force, an LED indicator, two M20 conduit entries and IP67 protection.
The operation key is separate; D4DS-K2 is the vertical-mounting key listed by Omron, while other D4DS keys address different mounting directions. Select the locking principle and safety architecture from the machine risk assessment and stopping behaviour, not from the switch's holding force alone.
Key Features
- Power-to-lock (solenoid-lock) operation with 24 VDC coil
- 2NC door contacts plus 1NC/1NO lock-monitor contacts, slow action
- 1300 N holding force and adjustable key-entry direction
- Plastic housing and head, LED indicator, two M20 conduit entries and IP67
- SKU: D4NL-4CFG-B
- Series: D4NL guard-lock safety-door switches
Best-Fit Applications
- Guard-door monitoring where door position and lock state must be wired separately to the safety system.
- Machines whose risk assessment calls for the guard to unlock when solenoid power is removed.
- Compact guarding installations that need adjustable key entry and separate selection of the operation key.
Buying Checklist
- Confirm power-to-lock is the required behaviour after power loss and during the machine's stopping time.
- Order the operation key and installation accessories separately after checking mounting direction.
- Validate the complete safety function, including monitoring device, wiring, diagnostics and risk assessment; the switch alone does not establish a PL or SIL.
Technical Specifications
| Manufacturer | Omron Corporation |
|---|---|
| Series | D4NL guard-lock safety-door switches |
| Model / SKU | D4NL-4CFG-B |
| Lock / release logic | Power to lock; mechanical release |
| Door contacts | 2NC, slow action |
| Lock-monitor contacts | 1NC / 1NO, slow action |
| Solenoid | 24 VDC |
| Holding force | 1300 N |
| Operation key | Standard resin key, sold separately; adjustable entry direction |
| Indicator | LED, 10–115 VAC/VDC |
| Conduit entries | 2 × M20 |
| Housing / head | Plastic / plastic |
| Protection / temperature | IP67 / −10 to +55 °C |
| Dimensions | 88.5 × 35.5 × 95 mm |
Manufacturer documentation
Omron's own product page, where the manufacturer's current specification and lifecycle information are published. We are an independent distributor and cannot mirror those documents; the link goes to Omron's site.
FAQ for D4NL-4CFG-B
Is D4NL-4CFG-B power-to-lock or power-to-unlock?
It is power-to-lock. The 24 VDC solenoid must be energised to lock the guard, and removing solenoid power releases it. Confirm that this behaviour suits the machine risk assessment and hazardous stopping time.
What contacts does D4NL-4CFG-B provide?
Two NC door contacts and one NC plus one NO lock-monitor contact, all in the slow-action arrangement shown by Omron. It is not a 2NC-plus-2NC model.
Which operation key fits D4NL-4CFG-B?
Omron lists the D4DS key family. D4DS-K2 is the vertical-mounting option; K1, K3 and K5 cover other mounting arrangements. The switch is supplied without the actuator, so select and order the key separately.
Does one D4NL-4CFG-B guarantee PL e or Category 4?
No. Performance Level and safety category depend on the complete safety function and architecture, including diagnostics, wiring, monitoring device and validation. Do not assign PL e or Category 4 from this switch's model number alone.
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