Omron D4NS-1AF — Plastic Safety Door Switch, 1NC/1NO
SKU: D4NS-1AFUSD 11.50
Plastic-body safety door interlock switch, tongue-operated, Pg13.5 1-conduit, 1NC + 1NO slow-action contacts, IP67, Type 2 / low-level coded per EN ISO 14119. Mechanical 1 M ops min. Pairs with D4DS-K1 / K2 / K3 operation key.
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Product Overview
The D4NS-1AF is the smallest plastic-body 1NC + 1NO tongue-operated safety door interlock switch in Omron's D4NS family, with Pg13.5 (metric EN ISO 20) cable entry (the '1AF' suffix decodes as: 1 = Pg13.5 1-conduit, A = 1NC + 1NO contacts, F = slow-action / not snap-action). It uses a separate operation key (D4DS-K1 / K2 / K3 / K5 family) that the operator inserts into the switch head when the door closes; the switch's tongue contacts then mechanically monitor whether the key is present (door closed) or absent (door open).
Where the D4NS-1AF sits in the D4NS safety door switch family
The D4NS family splits along four axes: conduit entry (1 = Pg13.5 metric, 2 = G1/2 inch Asian, 4 = M20 European metric, 4-NPT = 1/2-14NPT), contact configuration (A = 1NC + 1NO slow-action, B = 2NC slow-action, C = 2NC + 1NO slow-action), and actuator / head type (F = flat / straight, R = 4-direction adjustable, M = top-mount, A = high-holding-force). The D4NS-1AF (this SKU) is the 1-conduit Pg13.5 / 1NC + 1NO slow-action / flat-head variant — the standard pick for small panels and machine guards in EU/US/JP installations.
Standards, certifications, and safety category
The D4NS-1AF is certified to EN 60947-5-1 (low-voltage switchgear / controlgear — proximity switches section), EN ISO 14119 (interlocking devices for guards — Type 2, low-level coded), UL 508 (industrial control equipment), CSA C22.2 No. 14, and CCC (China Compulsory Certificate). It is suitable for use in safety circuits up to Category 1 / PL c per EN ISO 13849-1 and up to SIL 1 per EN 61508 when used with a single switch per door.
Installation, operation, and common pitfalls
Mount the D4NS-1AF with two M4 / M5 screws through the 4 mounting holes in the body (mounting centres 38 × 76 mm). The Pg13.5 cable entry accepts cable diameters 6 to 12 mm (gland included with the switch). The head can be removed / rotated for door orientation — the head has 4 possible insertion angles (90° rotation steps), allowing the door to approach from any of 4 directions. Wire the NC and NO contacts to your safety relay or monitoring device.
Key Features
- Plastic-body tongue-operated safety door interlock switch
- Pg13.5 1-conduit cable entry
- 1NC + 1NO contacts
- Forcibly-guided contact linkage
- Type 2 interlock / low-level coded per EN ISO 14119
- Mechanical life 1,000,000 operations min
- Electrical life 500,000 operations min at 3 A 250 VAC
- IP67 protection
- SKU: D4NS-1AF
- Series: D4NS Plastic-Body Safety Door Interlock Switch
- Voltage: 250 VAC
Best-Fit Applications
- Sliding-door interlock on a conveyor guard — D4NS-1AF mounted on the door frame, D4DS-K2 operation key attached to the sliding.
- Hinged-door safety monitoring on a packaging machine — D4NS-1AF on the machine frame, D4DS-K1 horizontal operation key on the hinged.
- Removable panel interlock on a hydraulic press — D4NS-1AF on the press body, D4DS-K3 angled operation key on the panel.
- Drawer interlock on a CNC machine tool — D4NS-1AF on the tool magazine drawer frame, D4DS-K5 adjustable operation key on.
Buying Checklist
- Pick D4NS-1AF for plastic-body 1NC+1NO safety door switch with Pg13.5 1-conduit — the standard pick for EU / US / JP installations
- Pick D4NS-4AF for the M20 1-conduit European-metric version of this SKU
- Pick D4NS-2AF for the G1/2 1-conduit Asian-standard version of this SKU
- Pick D4NS-4AF-NPT for the 1/2-14NPT 1-conduit version of this SKU
- Pick D4NS-SK1AF for a stainless-steel body IP69K washdown-rated variant
- Pick D4BL-2CRA for a die-cast aluminum 700 N guard-lock switch when the application requires mechanical lock-out
Technical Specifications
| Model | D4NS-1AF |
|---|---|
| Series | D4NS Plastic-Body Safety Door Interlock Switch |
| Type | Tongue-operated interlock (requires separate D4DS-Kx operation key) |
| Coding Level | Low-level coded (EN ISO 14119 Type 2) |
| Interlock Type | Type 2 per EN ISO 14119 (low-level coded, single-channel) |
| Conduit Entry | Pg13.5 1-conduit (cable gland included, accepts 6-12 mm cable OD) |
| Contact Configuration | 1NC + 1NO (slow-action, positive-opening NC per IEC 60947-5-1 Annex K) |
| Contact Type | Forcibly-guided contacts (VDE 0660-200 compliant) — welded NC cannot prevent NO from re-opening |
| Rated Voltage | 250 VAC (insulation voltage 250 V) |
| Rated Thermal Current | 10 A (at 250 VAC / 30 VDC) |
| Rated Operating Voltage (per IEC 60947-5-1) | AC-15: 240 VAC at 3 A / DC-13: 24 VDC at 1 A |
| Operating Temperature | -30 to +70 °C (no icing) |
| Storage Temperature | -40 to +80 °C |
| Wire Range | 0.5 to 1.5 mm² (AWG 20 to 16) |
| Dimensions (W × H × D) | 31 × 78 × 50 mm (body only, with Pg13.5 gland) |
Resources & Downloads
FAQ for D4NS-1AF
Does the D4NS-1AF include the operation key?
No — the D4NS-1AF is just the switch body. The operation key is a separate item (D4DS-K1 / K2 / K3 / K5, sold individually) and must be ordered separately.
What is the difference between snap-action and slow-action contacts?
The D4NS-1AF is a slow-action (simultaneous-make / simultaneous-break) switch — both the NC and NO contacts change state at the SAME moment as the key crosses a threshold position (around 6 mm insertion). A snap-action (D4NS-2BF or similar) switch has a mechanical snap mechanism that ensures the contact state changes INSTANTLY when the threshold is crossed — the snap action reduces the contact bounce that occurs on slow-action switches during slow door approach.
What's the difference between D4NS and D4BL?
Both are safety door interlock switches in Omron's D4-series, but they serve different applications. D4NS is the plastic-body non-locking interlock switch — the door is mechanically held closed by a separate latch mechanism (or just by the operator); the switch's only function is to detect whether the door is open or closed.
What safety category / SIL level can the D4NS-1AF achieve?
The D4NS-1AF by itself supports Cat 1 / PL c per EN ISO 13849-1 (lowest category using a single switch) or SIL 1 per EN 61508 — and only if used SINGLE-CHANNEL with a single safety input on the monitoring relay.
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