DX-W2 Safety Door Lock (Solenoid Guard Locking Interlock Switch)
Contact-type guard locking switch with 4 contact blocks in 14 NC/NO configurations and 1300 N holding force.
▶ Watch it in action: Safety Light Curtain + Guard-Locking Door Switch Interlock — Wiring Demo
🔍 Click to enlarge · 1/21Technical Specifications
| Output type | Mechanical contact type (C = NC, O = NO), 4 contact blocks, 14 combinations |
|---|---|
| Locking type | GD = electromagnetic locking / mechanical release; GC = mechanical locking / electromagnetic release |
| Head material | J = metal head / S = plastic head |
| Cable/conduit interface | G = M20 conduit entry (unwired as standard) / X = factory-fitted cable, 1.5 m |
| Solenoid voltage | 24 V DC ±10%, 4.8 W |
| Holding force | 1300 N |
| Protection rating | IP67 |
| Mechanical life | 1,000,000 operations |
| Electrical life | 150,000 operations |
| Contact ratings | AC-15 240V/3A; DC-13 30V/2.3A |
| Forced separation | ≥80 N / ≥10 mm |
| Operating temperature | -20°C to +60°C |
| Optional accessory | Rear manual unlock (DX-W2-L kit: sleeve + limit plate + 3× M4 screws + metal knob, 90° clockwise release) |
| Compatible actuator keys | DX-K series (11 keys) |
Overview
The DX-W2 is a mechanical-contact safety door lock (guard locking switch) that mechanically holds a machine guard door closed until a hazardous motion (e.g. a spindle running down) has come to a safe stop, then releases the lock via a solenoid. It reports two independent states through its contact blocks — the actuator key/tongue position and the lock status — so a safety relay or safety PLC can verify both "door closed" and "lock engaged" before allowing a machine to start.
It is intended for machine builders and panel integrators working with traditional relay-based (electromechanical) safety circuits, typically on CNC machine tools, injection/die-casting machines, and automated production-line fence access doors, where a coded/electronic (RFID) interlock is not required and a contact-output device that wires directly into existing relay logic is preferred.
Features & Benefits
Four contact blocks, 14 NC/NO configurations
Two independent contact compartments (head/actuator side and body/lock side) give four contact blocks in total, combinable into 14 patterns (CO/CO, 2C/2C, 3C/C, C/C2O, O/3C, 2C/2O, etc.) across 28 catalog models. This lets a panel builder pick exactly how many NC safety contacts and NO status/indication contacts are needed, without adding an external expansion relay.
1300 N holding force
The solenoid/mechanical lock mechanism holds 1300 N of force, resisting manual attempts to pull the guard door open while a machine's hazardous motion (e.g. spindle coast-down) is still in progress.
GD and GC locking-type versions
Every one of the 14 contact configurations is available in two locking types: GD (electromagnetic locking / mechanical release) and GC (mechanical locking / electromagnetic release), letting the safety-circuit designer choose the fail-safe behaviour that matches the application's risk assessment.
IP67-rated housing with gold-plated silver-alloy contacts
The switch is rated IP67 and built with a PA66 flame-retardant housing and gold-plated silver-alloy contact blocks, suited to environments with coolant spray, cutting oil mist, or dust around the guard door.
1,000,000 mechanical / 150,000 electrical operating cycles
Rated for 1,000,000 mechanical operating cycles and 150,000 electrical (contact-switching) cycles, giving a service-life margin for doors that are opened and closed frequently during shift changes, tooling, or maintenance.
Forced-separation escape function
In addition to normal solenoid-driven locking/unlocking, the mechanism supports forced separation (manual override) with ≥80 N force over ≥10 mm of travel, providing a way to open the door manually if power or the solenoid is unavailable.
24 V DC ±10% solenoid supply, 4.8 W
The solenoid operates on 24 V DC ±10% at 4.8 W (approximately 200 mA), matching the 24 V DC supply already present in most industrial control cabinets, so no separate high-voltage supply is needed for the locking mechanism itself.
Optional rear manual unlocking kit
An optional DX-W2-L accessory kit (sleeve sized to panel thickness, limit plate, 3× M4 screws, and a metal knob that releases with a 90° clockwise turn) adds a manual unlock point on the back of the guard, useful when the door needs to be opened from the machine-interior side.
Applications
Models & Ordering Information
GD Series — Electromagnetic Locking / Mechanical Release, Metal Head (M20 conduit entry)
GC Series — Mechanical Locking / Electromagnetic Release, Metal Head (M20 conduit entry)
How to Select
- Choose the head-side/body-side contact pattern (C = 1×NC, O = 1×NO, CO = 1×NC+1×NO, 2C = 2×NC, 3C = 3×NC, C2O = 1×NC+2×NO, 2CO = 2×NC+1×NO, 2O = 2×NO) based on how many NC (safety) and NO (status) contacts your circuit needs; 14 combinations are offered.
- Select GC (mechanical locking, electromagnetic release) or GD (electromagnetic locking, mechanical release) based on the fail-safe behaviour your risk assessment requires when power is lost.
- Choose G (M20 conduit entry, unwired, for field wiring) or X (factory-fitted 1.5 m cable, customizable length) for the cable/conduit interface.
- Choose J (metal head) for higher-mechanical-stress or metalworking environments, or S (plastic head) as a lighter-duty, lower-cost option.
- Match the switch to one of the 11 DX-K series operating keys based on door hinge geometry and approach angle; for hinged doors a door radius R > 300 mm is required, with a key positioning tolerance of ±1 mm.
- Add the optional DX-W2-L accessory kit if back-side (machine-interior) manual release is required.
📘 Need the full method? How to Choose a Safety Door Switch / Interlock
When NOT to specify the DX-W2 — and what to use instead
The application needs RFID-coded or electronic transistor output rather than mechanical contacts.
Why not: DX-W2 is a mechanical-contact device (C/O contact blocks) intended for relay-based circuits; it has no RFID coding or transistor output.
Use instead: DX-D6 guard-locking switch for RFID + NPN/PNP output, or DX-R1 for non-contact monitoring only
The risk assessment calculates guard-opening forces above the rated 1300 N holding force.
Why not: 1300 N is DX-W2's published holding force; loads above this exceed the documented capability of the lock.
Use instead: DX-D6 (2000 N holding force) if an electronic RFID output is acceptable, or consult the factory for supplementary restraint
The door is opened and closed at a rate that will exceed 150,000 electrical (contact-switching) operations over the machine's service life.
Why not: DX-W2's rated electrical life is 150,000 operations (versus 1,000,000 mechanical operations).
Use instead: DX-W5, whose electrical life is rated at greater than 150,000 operations
Only one or two safety-contact channels are needed and the extra contact blocks would go unused.
Why not: DX-W2 provides four contact blocks across 14 combinations, more than a single- or dual-channel circuit typically requires.
Use instead: DX-W3, the simplified 2-contact-block version of the same platform
The project needs a published PFHd, or an independently issued certificate number rather than a design-basis claim.
Why not: DX-W2 is a mechanical-contact interlock with no PFHd/B10d/MTTFd or certificate number published; certification documents are supplied only on request.
Use instead: Request the certification package from the factory and validate the complete circuit with a DA31 or DQSRN safety relay
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.
- PFHd / B10d / MTTFd reliability figures
- Certificate number and scope for the design basis
- Overall body dimensions and weight
- Connector pin-out for the X (factory-fitted cable) variant
- Approach speed / minimum safety-distance guidance per ISO 13855
- Coating/finish corrosion-resistance rating beyond the PA66 housing note
Frequently Asked Questions
What does "GD" and "GC" mean in the DX-W2 order code?
How many contacts does the DX-W2 have, and can I choose the NC/NO mix?
What is the holding force of the DX-W2 lock?
What voltage does the solenoid operate on?
What is the protection (ingress) rating of the DX-W2?
What is the mechanical and electrical life of the DX-W2?
Can the DX-W2 be opened manually if there is a power failure or the solenoid does not release?
What contact ratings does the DX-W2 support?
What is the operating temperature range?
Does the DX-W2 use a contact (relay-wired) output or an electronic/coded (RFID) output?
What operating key options are available for the DX-W2?
Can you provide certification documents for the DX-W2, such as CE?
Works Well Together
On the same machine or line, DX-W2 is typically ordered together with: Safety Relays · Safety Light Curtains · Safety Mats
DA31 Emergency-Stop Safety Relay Module
Ultra-slim 22.6 mm Category 4/PL e/SIL 3 safety relay with dual-channel PNP/NPN input and a solid-state status output.
DCE Automation Safety Light Curtain
Compact through-beam safety light curtain in a 30 x 30 mm housing: 10/20/30/40 mm beam pitch, up to 72 beams, 0.3-3 m or 0.3-6 m sensing distance, NPN/PNP output. Designed to the Type 4 architecture of IEC 61496-1/-3 and Category 4 (PLd) of ISO 13849-1.
JT14 Safety Mat (Economical)
Economical pressure-sensitive safety mat with volt-free N.O. output for large-area or custom-shape floor guarding.
Related Products in Safety Door Locks & Switches
DX-C1 Magnetic Coded Safety Switch
Non-contact coded-magnet safety switch with 17 mm sensing range and high misalignment tolerance for guard doors.
DX-D2 & DX-D3 Safety Door Switch
Mechanical NC/NO safety interlock switch, IP67, 1,000,000-cycle mechanical life, no locking function.
DX-D6 Guard Locking Safety-Door Switch
Guard locking safety-door switch: 2000 N holding force, redundant dual outputs, RFID-coded actuators.
DX-K Series Safety Door Lock Operation Keys
11-model range of fixed and adjustable operation keys for DX-W2/W3/W5 and DX-D2/D3 safety door interlock switches.