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Omron D4DS-K2 Non-Contact Safety Door Switch Coded Actuator — front view

Omron D4DS-K2 Safety-Door Hinge Switch with Vertical Operation Key

SKU: D4DS-K2

USD 1.50

Omron D4DS-K2 compact safety-door hinge interlock switch, 1NC/1NO slow-action, vertical key insertion, M20 conduit, for light-duty guard doors on packaging and assembly cells.

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Product Overview

The Omron D4DS-K2 is a compact, hinge-mount safety-door switch designed to be paired with a D4DS-series operation key (the "-K2" suffix denotes vertical / top key insertion). When the guard is closed, the key enters the switch head and actuates the contacts; pulling the guard open withdraws the key and forces the NC contact open.

The D4DS body shares a footprint with the D4NS family and is typically used on smaller doors where the space-saving form factor of the D4GL is not required but the same direct-opening mechanism is. It is rated for slow-action (simultaneous make/break) operation with gold-clad snap-action contacts, so it can switch both standard contactor loads and the low-current inputs of a safety relay or PLC.

The switch mounts through a single panel cut-out with two M5 screws, and the key is captured by a hinged bracket on the door leaf. The head is rotatable through 90° in the field so the same part can serve left- or right-hinged doors. The M20 conduit opening accepts a cable gland sized for the wiring route.

Typical use is on small to mid-size guard doors: packaging machine enclosures, light-curtain-protected workstations, robotic palletiser fences, and end-of-line test cells. The D4DS-K2 is a Cat 1 / PL c device on its own; for Cat 3 / PL d or Cat 4 / PL e circuits, wire the NC contact through a safety relay (e.g. Omron G9SA) or safety PLC together with a second guard-monitoring contact.

Key Features

  • 1NC / 1NO slow-action contact set, direct-opening on the NC
  • Vertical operation-key insertion (D4DS-K2) — head rotates 90° for left/right doors
  • Compact body shares footprint with the D4NS interlock family
  • Gold-clad contacts handle both standard and microload circuits
  • M20 conduit entry with captive cover screw
  • IP67 rated for washdown environments
  • Mechanical operating life ≥ 1,000,000 operations (Omron catalogue value)
  • Conforms to EN ISO 14119 for interlock devices
  • SKU: D4DS-K2
  • Series: D4DS
  • Voltage: 250 VAC

Best-Fit Applications

  • Guard doors on packaging machines and small assembly cells
  • Hinge-mounted interlocks on light-curtain-protected workbenches
  • End-of-line test-cell access doors
  • Palletiser and de-palletiser fence gates
  • Retrofit of older D4NS installations to a smaller-footprint switch

Buying Checklist

  • Confirm key-mounting direction (K1 / K2 / K3 / K4 / K5) matches your door hinge
  • Check that the conduit thread (M20 vs PG13.5) matches your existing cable gland
  • For Cat 3 / PL d or higher, plan a safety relay — the D4DS alone is Cat 1 / PL c
  • If your door has play > 2 mm, verify the key insert / radius spec is met
  • Order the matching operation key (sold separately) at the same time

Technical Specifications

Series D4DS
Model D4DS-K2
Switch type Safety-door hinge interlock (mechanical, with operation key)
Key insertion Vertical (K2 variant)
Contact configuration 1NC / 1NO, slow-action
Rated voltage 250 VAC
Rated current (resistive) 10 A
Minimum applicable load 5 mA at 24 VDC (gold-clad contacts)
Conduit size M20
Protection rating IP67
Operating temperature -30 °C to +70 °C
Mechanical operations ≥ 1,000,000 (per Omron catalogue)
Mounting Two M5 screws, panel cut-out
Approvals CE, UL, CSA, TÜV

FAQ for D4DS-K2

Is the D4DS-K2 a non-contact switch?
No. The D4DS series is a mechanical interlock that requires a physical operation key. The "-K2" suffix indicates vertical key insertion. If you need a non-contact (magnetically-coded) switch, look at the D40 series instead.
What operation key do I need?
The D4DS-K2 takes the standard D4DS vertical-mount key (the same key used across the K1–K5 directional variants). The key is sold separately from the switch body.
What safety category does the D4DS achieve?
On its own the D4DS is suitable for Category 1 / PL c circuits. To reach Category 3 / PL d or Category 4 / PL e you need to route the NC contact through a safety relay such as the Omron G9SA or G9SP, in combination with a second monitoring contact.
Can the head be rotated after mounting?
Yes. The head is held by four captive screws and can be indexed in 90° steps to match the door hinge direction.

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