DX-D2 & DX-D3 Safety Door Switch

Name: DX-D2 & DX-D3 Safety Door Switch
Brand: DAIDISIKE
SKU: dx-d2-and-dx-d3-safety-door-switch
Availability: InStock

Mechanical NC/NO safety interlock switch, IP67, 1,000,000-cycle mechanical life, no locking function.

▶ Watch it in action: Safety Light Curtain + Guard-Locking Door Switch Interlock — Wiring Demo

DX-D2 & DX-D3 Safety Door Switch - product photo

🔍 Click to enlarge · 1/21

Technical Specifications

Output Type	Mechanical contact (NC/NO combination, no locking function)
Head Material	Resin
Protection Rating	IP67
Mechanical Life	1,000,000 operations
Electrical Life	300,000 operations
Rated Insulation Voltage Ui	400V
Conventional Thermal Current Ith	8A
Rated Operational Voltage/Current Ue / Ie	AC400V / 2A
Forced Separation	≥60N / ≥10mm
Standards	IEC/EN60947-5-1; GB14048.5-2017
Cable Connection	Factory-fitted PG13.5 cable gland
Key Insertion Orientations	8 directions

Overview

DX-D2 and DX-D3 are mechanical, contact-based safety door switches - tongue/key-operated interlock switches for machine guard doors. A matching actuator key from the DX-K series (8 insertion orientations) is inserted into the switch head; when the guard door is opened, the key withdraws and mechanically drives the internal NC/NO contact block. These two models have no electronic OSSD output and no mechanical locking segment - they are a straightforward, monitoring-only interlock rather than a locking safeguard.

They suit OEM machine builders and panel/equipment integrators who need to wire door-open detection into a safety relay or safety PLC for guard doors, inspection hatches, and access covers where a locking/holding function is not required. The range covers four ordering codes with different NC/NO contact combinations, an IP67-rated resin head, forced contact separation of at least 60N over at least 10mm of travel, and a rated mechanical life of 1,000,000 operations with a rated electrical life of 300,000 operations.

Features & Benefits

Mechanical Contact Interlock, No Wiring Ambiguity

Pure NC/NO contact output integrates directly with conventional safety relays without needing OSSD-capable inputs.

Four Contact Configurations for Circuit Redundancy

DX-D2-CO (1NC+1NO), DX-D2-2C (2NC), DX-D3-2CO (2NC+1NO), and DX-D3-3C (3NC) let designers choose single-channel or redundant dual-channel wiring.

IP67-Rated Resin Head

Sealed construction suited to washdown, dust, or coolant-mist areas around the guard door.

Long Mechanical/Electrical Life for High-Cycle Doors

Rated 1,000,000 mechanical operations and 300,000 electrical operations reduces the maintenance burden on frequently opened access doors.

Forced Contact Separation for Direct-Opening Reliability

Forced separation force of at least 60N with at least 10mm of travel is a design feature intended to help the NC contacts open even if a contact welds shut, supporting fail-safe wiring practice.

Designed to Relevant IEC/GB Safety Switch Standards

Complies with the design requirements of IEC/EN60947-5-1 and GB14048.5-2017 for low-voltage switchgear control-circuit devices and interlock switching elements.

8 Key-Insertion Orientations for Flexible Door Layouts

The switch accepts its actuator key from 8 different directions, easing mounting on doors that hinge or slide from either side.

Ready Cable Connection Out of the Box

Supplied with a factory-fitted PG13.5 cable gland, cutting installation steps on the panel line.

Applications

Machine Guard Doors on Production Equipment — The mechanical contact signal can be wired directly into a safety relay to detect whether the door is fully closed before allowing the machine to start.

Inspection Hatches / Maintenance Access Covers — The high rated mechanical life (1,000,000 operations) suits locations that need to be opened for inspection frequently.

Basic Interlocking on Cost-Sensitive OEM Machines — With no locking function and a simple mechanical contact structure, DX-D2/DX-D3 serve as the economical option in the door lock line for simple circuits that do not require the door to be held locked.

Panels or Enclosures Requiring IP67 Sealing — The IP67-rated resin head supports installation on cabinet doors or guards near washdown areas or coolant-mist environments.

Combination with DXL Safety Door Bolt — The DXL safety door bolt series has pre-drilled mounting holes that accept DX-W2/W3/D2/D3 switches, giving a combined switch-plus-bolt configuration; DX-D2/D3 itself provides no locking action, which the DXL bolt supplies.

Redundant Dual-Channel Safety Circuits — Multi-contact models such as DX-D2-2C (2NC), DX-D3-2CO (2NC+1NO), and DX-D3-3C (3NC) support dual-channel wiring to improve circuit reliability.

Retrofit/Replacement of Legacy Mechanical Interlock Switches — The mechanical contact structure is compatible with conventional safety relays, making it suitable for replacing similar older-style door switches on legacy machines.

Models & Ordering Information

DX-D2 / DX-D3 Ordering Codes

DX-D2-CODX-D2-2CDX-D3-2CODX-D3-3C

CO = 1NC+1NO, 2C = 2NC, 2CO = 2NC+1NO, 3C = 3NC. All variants use a resin head and have no locking function (no C/D segment).

How to Select

DX-D2-CO (1NC+1NO): a single-channel safety signal plus one auxiliary signal (e.g. status indication), suited to the most basic interlock-plus-feedback needs.
DX-D2-2C (2NC): two normally-closed contacts, usable as a dual-channel redundant safety circuit.
DX-D3-2CO (2NC+1NO): two normally-closed contacts form the safety channel, with one normally-open contact available as an auxiliary/indication signal for circuits needing an extra output.
DX-D3-3C (3NC): three normally-closed contacts, suited to more complex multi-circuit interlocking or applications needing three independent signals.
DX-D2 and DX-D3 both have no locking function (no C/D segment); if the equipment needs the door to be locked or held closed, choose another door lock series from the factory range that offers locking, or combine with the DXL mechanical door bolt.
Both series use an IP67 resin head suited to general industrial environments and washdown, dust, or oil-mist locations; confirm with the factory if the application involves harsher chemical exposure or high-pressure washdown.
8 key-insertion orientations are available; select the orientation that matches the door's hinge or sliding direction.
Check the switch's electrical ratings - Ui 400V, Ith 8A, Ue AC400V / Ie 2A - against the safety relay or control circuit it will be wired into.
Select DX-D2/DX-D3 when the project requires design compliance with IEC/EN60947-5-1 or GB14048.5-2017.

📘 Need the full method? How to Choose a Safety Door Switch / Interlock

When NOT to specify the DX-D2 — and what to use instead

Machine risk assessment requires the guard door to stay locked closed during coast-down or other lingering hazard.

Why not: Per the current model list, DX-D2 and DX-D3 have no locking segment -- they detect door position only and do not hold or lock the door.

Use instead: DX-D6 guard-locking switch, DX-W2/DX-W3 solenoid door locks, or a DX-D2/DX-D3 switch combined with the DXL mechanical door bolt

The application needs RFID-coded or non-contact sensing to resist substitute-actuator defeat or to tolerate door misalignment without mechanical wear.

Why not: DX-D2/DX-D3 use a mechanical key/tongue and plain NC/NO contacts, with no coding level and no non-contact tolerance for misalignment.

Use instead: DX-R1 non-contact RFID-coded safety switch

The switched load exceeds the device's electrical ratings (Ui 400V, Ith 8A, Ue AC400V / Ie 2A).

Why not: These are the published limits for DX-D2/DX-D3 contacts; driving heavier loads directly risks contact damage or welding.

Use instead: Route the load through a DA31 or DQSRN safety relay sized for the actual load, using DX-D2/DX-D3 only as the pilot signal

The environment requires ingress protection above IP67 (e.g. high-pressure washdown).

Why not: DX-D2/DX-D3's resin head is rated IP67, with no higher ingress-protection option published for this series.

Use instead: Confirm washdown requirements with the factory before specifying, or evaluate the DX-C1/DX-R1 series (IP65 standard, custom up to IP68)

The project needs a single, formally certified safety-function block with a published PFHd for a SISTEMA calculation.

Why not: DX-D2/DX-D3 are only stated as designed to IEC/EN60947-5-1 and GB14048.5-2017; no PFHd/B10d/MTTFd or certificate number is published for the device.

Use instead: Request certification documents from the factory and perform the PL/SIL calculation at the safety-relay level (DA31/DQSRN)

Specifications we do not publish yet

We only publish a figure once we are confident it is true. The items below are still being validated through further testing and real-world customer feedback, so for now we would rather leave them open than guess. If one of them matters to your design, ask us for the latest validated status.

Operating temperature range
PFHd / B10d / MTTFd reliability figures
Certificate number and scope for the IEC/EN60947-5-1 / GB14048.5-2017 design basis
Overall dimensions and weight
Mechanical/dimensional distinction between the DX-D2 and DX-D3 bodies beyond contact count
Housing/actuator material specification is not published yet

Frequently Asked Questions

Is the DX-D2/DX-D3 an electronic (OSSD) safety switch or a mechanical contact switch?

DX-D2 and DX-D3 are mechanical contact-type safety switches. They use conventional NC/NO contacts operated by a key/tongue actuator, not an electronic OSSD output.

Do DX-D2 and DX-D3 have a door-locking function?

No. Per the current model list, both series have no locking segment (no C/D code) - they detect door position only and do not hold or lock the door closed.

What contact configurations are available?

Four ordering codes: DX-D2-CO (1NC+1NO), DX-D2-2C (2NC), DX-D3-2CO (2NC+1NO), and DX-D3-3C (3NC).

What is the difference between DX-D2 and DX-D3?

Both use the same mechanical contact operating principle and resin head construction; the model data available distinguishes them mainly by contact configuration (DX-D2 offers 1NC+1NO or 2NC; DX-D3 offers 2NC+1NO or 3NC). Further mechanical/dimensional differences between the two series have not yet been confirmed by the factory.

What IP rating do these switches carry?

IP67.

What standards are these switches designed to?

IEC/EN60947-5-1 and GB14048.5-2017, which cover low-voltage switchgear control-circuit devices and switching elements including interlock switches.

What is the rated electrical life?

Rated mechanical life is 1,000,000 operations and rated electrical life is 300,000 operations.

What does forced separation mean on this switch and why does it matter?

Forced separation (at least 60N of force, at least 10mm of travel) is a mechanical design feature that helps force the NC contacts open even if they have welded shut, which supports fail-safe safety-circuit wiring practice.

Can DX-D2/DX-D3 be combined with a mechanical door bolt for locking?

Yes. The related DXL safety door bolt series has pre-drilled mounting holes that accept DX-W2/W3/D2/D3 switches, allowing a combined switch-plus-bolt configuration where door locking is provided by the DXL bolt rather than by DX-D2/DX-D3 itself.

What cable connection does the switch use?

It ships with a factory-fitted PG13.5 cable gland.

Are DX-D2 and DX-D3 certified to any safety standard?

Certification documents are available on request.