Omron D4SL-N4EFA-DN — Solenoid-Lock Safety Switch, 4P
SKU: D4SL-N4EFA-DNUSD 68.00
D4SL-N compact 4-contact solenoid-locking safety-door switch, plastic head, mechanical lock / solenoid release, 1300 N, 24 VDC, M20.
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Product Overview
The Omron D4SL-N4EFA-DN is the 4-contact model in the D4SL-N compact solenoid-locking safety-door switch family. The head accepts an operation key (D4SL-K1 / K2 / K3 / K5, sold separately) and the solenoid locks the key in place when the cabinet door is closed. The "A" suffix is the lock code: mechanical lock with solenoid RELEASE. The default state is LOCKED -- the door stays locked if power to the cabinet is lost, so operators cannot open the guard on a machine that has stopped but still has a hazardous flywheel or a capacitor bank to discharge.
Why the 4-contact model is the common pick
The 4-contact form (2NC/1NO door + 1NC/1NO lock monitor, all slow-action with certified direct opening on the NCs per EN 60947-5-1) is enough wiring for a Cat 3 / PL d dual-channel safety circuit -- one NC channel for the door position, one NC for the lock monitor, the NO for a non-safety monitor signal, and the remaining NC for redundancy. Step up to the 5-contact (3NC+2NC/1NO) or 6-contact (3NC+3NC) when the upstream safety controller (G9SA-301, G9SP-N20S) wants two channels per door for Cat 4 / PL e.
Why the A code vs the C code matters
Pick the A code (mechanical lock with solenoid release -- this SKU) when the door must stay locked during a power loss -- the standard pick for a vertical-spindle press, a robot cell, a hydraulic accumulator bank, a centrifuge, a high-inertia flywheel. Pick the C code (solenoid lock with mechanical release) instead when the door must UNLOCK during a power loss -- a fire-egress enclosure, a maintenance-only interlock where a trapped operator must be able to exit without mains power. The D4SL-N4EFA-DN does not unlock on power loss.
Before ordering
Order the operation key (D4SL-K1 for horizontal insertion, K2 for vertical, K3 for adjustable, K5 for angled) at the same time -- the switch is incomplete without it. Match the conduit to the cabinet -- the bare D4SL-N4EFA-B is Pg13.5, the -DN is M20 (this SKU), the -D4N is G1/2. Pair the switch with a G9SA-301, G9SP-N20S, or the equivalent safety controller for the dual-channel Cat 3 / PL d or Cat 4 / PL e circuit.
Key Features
- D4SL-N-series compact solenoid-locking safety-door switch
- 4-contact slow-action (2NC/1NO + 1NC/1NO) with certified direct opening on the NCs per EN 60947-5-1
- Plastic head with standard resin release key (E code = horizontal mounting)
- Mechanical lock with solenoid RELEASE (A code -- fail-safe LOCK on power loss)
- 24 VDC solenoid, 0.20 A (4-contact) / 4.8 W with internal constant-current switchover
- Orange operation LED on AC/DC 10-115 V input, ~10 mA draw
- 1300 N minimum holding force on the operation key
- M20 conduit entry (the -D suffix; -B is Pg13.5, -D4 is G1/2, -C is M12 connector)
- IP67 rated for direct water-spray environments
- EN ISO 14119 type 1 interlock, EN 60947-5-1, GS-ET-19, EN 60204-1
- TUV SUD / UL / CQC (CCC) / KOSHA approved, 1 million mechanical operations
- Operation key D4SL-K1 / K2 / K3 / K5 sold separately (REQUIRED)
- SKU: D4SL-N4EFA-DN
- Series: D4SL-N4EFA-DN
- Voltage: 24 VDC
Best-Fit Applications
- Locking a guard door on a vertical-spindle press where the door must stay locked on power loss
- Robot-cell access interlock where the cell must remain closed during capacitor discharge
- Hydraulic-press guard door with Cat 3 / PL d dual-channel safety circuit
- High-inertia flywheel or centrifuge guard with hazardous coast-down time
- Locking interlock on a parts-load station where the door stays locked during the machine cycle
- Spare-card replacement on a D4SL-N panel with a failed switch and matching key already in service
Buying Checklist
- Pick D4SL-N4EFA-DN for the 4-contact D4SL-N with fail-safe LOCK on power loss (mechanical lock with solenoid release).
- Pick D4SL-N4CFA-DN instead when the door must UNLOCK on power loss (solenoid lock with mechanical release, fire-egress use).
- Pick the 5-contact D4SL-N5EFA-DN or 6-contact D4SL-N6EFA-DN when the upstream safety controller needs more channels for Cat 4 / PL e.
- Pick the metal-head D4SL-N4RFA-DN for higher impact environments (forging, stamping, foundry).
- Pick the G1/2 conduit D4SL-N4EFA-D4N for North-American cabinet threading, or the Pg13.5 D4SL-N4EFA-B for European cabinets.
- Order the operation key (D4SL-K1 / K2 / K3 / K5) at the same time -- the switch is incomplete without it.
- Pair the switch with a G9SA-301 / G9SP-N20S safety controller for the dual-channel Cat 3 / PL d or Cat 4 / PL e circuit.
Technical Specifications
| Contact Configuration | 4 slow-action, 2NC/1NO + 1NC/1NO |
|---|---|
| Direct Opening | Certified on the NC contacts per EN 60947-5-1 |
| Lock Type | Mechanical lock with solenoid release (A code, fail-safe LOCK on power loss) |
| Solenoid Voltage | 24 VDC (+10 % / -15 %), 0.20 A, 4.8 W |
| Holding Force | 1300 N minimum |
| Indicator | Orange LED, AC/DC 10-115 V, ~10 mA draw |
| Conduit | M20 (D suffix; -B is Pg13.5, -D4 is G1/2, -C is M12) |
| Head Material | Plastic (F code; R / M / G is metal) |
| Operating Temperature | -10 to +55 C, IP67 |
| Mechanical Life | 1 million operations minimum |
| Approvals | TUV SUD / UL / CQC (CCC) / KOSHA / EN ISO 14119 / EN 60947-5-1 |
| Operation Key | D4SL-K1 / K2 / K3 / K5 sold separately (REQUIRED) |
Resources & Downloads
FAQ for D4SL-N4EFA-DN
Does the D4SL-N4EFA-DN achieve Cat 4 / PL e by itself?
No. One switch with single-channel wiring cannot achieve Cat 4 / PL e -- that category requires two channels of wiring from the safety input device PLUS the D4SL's certified direct-opening contacts PLUS an upstream safety controller that monitors both channels. With the 4-contact D4SL-N4EFA-DN, a typical Cat 3 / PL d circuit is one NC channel for the door position and one NC channel for the lock monitor, fed into a G9SA-301 or equivalent. For Cat 4 / PL e, step up to the 6-contact D4SL-N6EFA-DN with two channels per door.
What is the difference between the A code and the C code?
Lock direction. The A code is mechanical lock with solenoid RELEASE: the default state is LOCKED, the solenoid must be energised to release the lock, and the door stays locked if power is lost. The C code is solenoid lock with mechanical release: the default state is UNLOCKED, the solenoid must be energised to engage the lock, and the door unlocks if power is lost. Pick A for hazardous machinery (the common pick); pick C for fire-egress enclosures where a trapped operator must be able to exit without mains power.
Does the operation key ship with the switch?
No. The operation key (D4SL-K1 horizontal / K2 vertical / K3 adjustable / K5 angled) is a separate line item and must be ordered at the same time -- the switch is incomplete without the key. The K1 is the common pick for a hinged door on the horizontal plane; the K3 is the adjustable pick when the door alignment varies; the K2 is for vertical insertion (a sliding guard).
What conduit size does the D4SL-N4EFA-DN use?
M20. The D suffix in the model code is the M20 conduit entry. The bare D4SL-N4EFA-B is Pg13.5 for European cabinet threading; the D4SL-N4EFA-D4N is G1/2 for North-American threading. The connector-style siblings are the D4SL-N4EFG-D (M20 with an integrated connector) and the D4SL-N4EFC-DN (M12 connector). All other specifications are identical to this SKU.
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