Omron D4NL-1AFG-B Guard-Lock Safety-Door Switch, Solenoid Lock, 24 VDC
SKU: D4NL-1AFG-BUSD 58.00
Omron D4NL-1AFG-B guard-lock safety-door switch, solenoid release, 24 VDC, 1NC/1NO + 1NC/1NO dual-contact block, 1,300 N holding force, M20 conduit, IP67.
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Product Overview
The Omron D4NL-1AFG-B is a guard-lock safety-door switch: when the door is closed and the solenoid is energised, the operation key is held captive and the door cannot be opened, even if the operator pulls on it. Releasing the solenoid frees the key and allows the door to swing open.
The "-1AFG-B" suffix breaks down as: 1NC/1NO main contact + 1NC/1NO lock-monitor contact, spring-lock (mechanical lock) with solenoid release, M20 conduit, and the standard (B) head. The solenoid is 24 VDC, which is the common control-cabinet rail voltage. Holding force is 1,300 N minimum — well above the EN ISO 14119 figure of 1,000 N typically required for category-3 and category-4 circuits.
D4NL switches are used on doors that have to stay locked while a machine is in a hazardous state (for example, a robot cell with residual stored energy, or a press whose cycle cannot be interrupted mid-stroke). The lock monitor contact (1NC/1NO) feeds back to the safety controller so the controller can prove the door is actually locked before allowing motion to start.
Installation is panel-cut-out with four screws; the head is rotatable through 360° in 90° steps so the same part works on left- or right-hinged doors and on sliding gates. IP67 means the switch tolerates washdown. Operating temperature range is -10 °C to +55 °C.
Key Features
- 1,300 N minimum holding force (EN ISO 14119-compliant)
- Solenoid-release (mechanical lock) — door stays locked on power loss
- Dual contact block: 1NC/1NO door + 1NC/1NO lock monitor
- 24 VDC solenoid — matches standard control-cabinet rails
- Head rotatable 360° in 90° steps for any door swing direction
- M20 conduit with captive cover screw
- IP67 sealed against water and oil ingress
- Direct-opening NC contacts (positive-mode per IEC 60947-5-1)
- SKU: D4NL-1AFG-B
- Series: D4NL
- Voltage: 24 VDC
Best-Fit Applications
- Robot cells with residual stored energy
- Press guards that cannot be opened mid-cycle
- CNC machine enclosure doors
- Palletiser fence gates with run-down time
- Any Category 3 / PL d or Category 4 / PL e guard that must stay locked during a hazardous state
Buying Checklist
- Verify the lock direction in the suffix — A is solenoid release, B/F are power-to-lock variants
- Check the contact block code (1A / 4A / 1B / 4B / 1C / 4C) matches your safety circuit
- Order the matching D4NL operation key (sold separately) — different keys per head direction
- Plan a 24 VDC supply sized for the inrush of the solenoid (≈ 200 mA per switch)
- If your door has any play, the lock monitor contact will chatter — use the NC monitor, not the NO, for safety
Technical Specifications
| Series | D4NL |
|---|---|
| Model | D4NL-1AFG-B |
| Lock type | Spring lock, solenoid release (24 VDC) |
| Contact configuration | 1NC/1NO (door) + 1NC/1NO (lock monitor) |
| Holding force | 1,300 N minimum |
| Solenoid voltage | 24 VDC |
| Conduit size | M20 |
| Rated current (resistive) | 10 A at 250 VAC / 24 VDC |
| Minimum applicable load | 5 mA at 24 VDC |
| Protection rating | IP67 |
| Operating temperature | -10 °C to +55 °C |
| Mechanical operations | ≥ 1,000,000 |
| Connection | M20 conduit, screw terminals inside |
| Approvals | CE, UL, CSA, TÜV (per Omron datasheet) |
Resources & Downloads
FAQ for D4NL-1AFG-B
What does "solenoid release" mean?
The door is mechanically locked by a spring; energising the 24 VDC solenoid releases it. If power is lost, the door stays locked — which is the safe failure mode for a guard that protects against stored energy.
What holding force do I need?
EN ISO 14119 expects at least 1,000 N for most Category 3/4 circuits. The D4NL's 1,300 N is comfortably above that, and is large enough to defeat casual attempts to force the door open.
Is the lock monitor contact a safety contact?
It can be used as part of a Category 3 / PL d circuit when wired in series with the door contact, but on its own it is an indication contact — its role is to prove the lock is actually engaged before motion starts.
Can I get a power-to-lock variant?
Yes — that is the D4NL-1BFG-B / -4BFG-B family. The "B" lock-type code in the suffix means power-to-lock. Use solenoid release (this part) for stored-energy hazards; use power-to-lock only when a manual escape must remain possible during power loss.
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