CNC machine tools
Monitors the sliding guard on a machining centre and drops the drive enable when the door opens.
Safety Interlock · Mechanical, 2 contacts
QSDP Mechanical Safety Interlock Switch
A mechanical two-contact interlock for guard doors that need a simple, hard-wired safety contact. Flame-retardant Pa66 housing, copper contacts, IP67 sealing
Model QSDP-□□ · Brand LE Raun · Category: Safety Door Locks & Interlocks
Contacts2 NC/NO contacts
HousingFlame-retardant Pa66
Forced release≥10 mm
ProtectionIP67
Overview
The QSDP is the mechanical option in the range: a positive-opening switch with two contacts, actuated by a key mounted on the guard door. There is no locking solenoid, so the switch reports door position but does not hold the door closed.That makes it the right choice where the door already has a mechanical latch, where the machine stops quickly enough that holding force is not needed, or where a simple series contact in the safety circuit is all the risk assessment calls for. Rated 300 V / 8 A thermal, AC-15 utilisation category, and sealed to IP67 for coolant and washdown.
Application scenarios
Injection moulding machines
Guards the mould area door on machines where a mechanical latch already holds the door.
Semiconductor equipment
Small, sealed switch for the front access panel of a process tool.
Machining centres with tool changers
Interlocks the tool-change opening.
Grinding and deburring machines
Sealed against coolant mist on manual load machines.
Sliding guard on a machining centre
The actuator rides on the sliding panel; the positive-opening NC contact drops the drive the moment the panel starts to move.
Hinged guard on a packaging machine
A right-angle actuator (DE-K2) follows the door arc without a lever, so the switch survives frequent opening.
Tool-change hatch
Signals hatch-closed to the PLC on the NO contact while the NC contact stays in the safety chain.
Industries
- Machine tools
- Injection moulding
- Semiconductor
- Metalworking
Technical specifications
| Model | QSDP-□□ |
|---|---|
| Housing material | Flame-retardant Pa66 |
| Contact material | Copper contacts |
| Rated insulation voltage | 300 V |
| Rated impulse withstand voltage | 4.0 kV |
| Rated thermal current | 8 A |
| Utilization category | AC-15 |
| Rated operational voltage | 400 V |
| Rated operational current | 3 A |
| Forced release distance | ≥10 mm |
| Permissible operating speed | 0.05–0.5 m/s |
| Protection level | IP67 (acc. to EN 60947-5-1, except key-actuation aperture) |
| Product application | Suitable for CNC machine tools, injection-moulding equipment, semiconductor manufacturing equipment, etc. It ensures that the machine does not perform hazardous movements when the safety guard door is opened. |
| Contact resistance | ≤25 mΩ |
| Mechanical life | 1,000,000 operations |
| Electrical life | 500,000 operations |
| Operating frequency | 0.05–1 Hz (max. 120 operations per minute) |
| Ambient temperature | −25 … +80 °C, no icing |
Dimensions
| Item | Value |
|---|---|
| Head | 30 × 21.5 mm, 2 × M5 mounting |
| Actuator entry | Ø24 ± 0.2 mm, 21 ± 1 mm from the base |
| Coding | Mechanical, 4 actuator styles (DE-K1 … DE-K4) |
| Contact type | Positive opening NC per EN 60947-5-1 Annex K |
| Weight | approx. 160 g |
The switch is supplied with the actuator of your choice; the DE-K series has six head shapes so the actuator can approach from the top, the side or the front.
Wiring & output
| Terminal | Contact |
|---|---|
| 21 – 22 | NC, positive opening (second circuit) |
| 33 – 34 | NO |
| 41 – 42 | NO (where fitted) |
How to specify
- 01
Decide whether the guard must be locked
Monitoring only (mechanical interlock) is enough where the machine stops within the time the door needs to open. Locking is required where a spindle, press or robot arm keeps moving after the stop command.
- 02
Choose the coding
Mechanical actuation is the simplest and cheapest. RFID and magnetic coding resist defeat with a spare actuator, tolerate misalignment and are the usual choice on washdown or vibrating guards.
- 03
Pick the contact configuration
Count the circuits: two NC for a dual-channel safety input, one NO for the door-closed signal to the PLC, plus one more NO if the lock state has to be reported separately.
- 04
Check the holding force against the door
Fzh is the force the lock withstands before the guard can be pulled open. Large sliding guards and guards with a long lever need the 2,000 N class rather than the 1,300 N class.
- 05
Allow for the actuator radius
The actuator swings on the door hinge; the catalogue gives the minimum door radius for each model. Below that radius the actuator will bind and the switch will wear out.
Why this series
Positive mechanical opening
The contact opens by direct actuation, so a welded contact cannot leave the circuit closed.
IP67 sealing
Rated to EN 60947-5-1 for coolant, chips and washdown — the key aperture is the only exception.
Simple series wiring
Two contacts drop straight into an existing safety relay or e-stop chain.
Questions
Does the QSDP lock the door?
No. It is a position-monitoring interlock with a mechanical actuator; holding force comes from the door's own latch. If the risk assessment requires the door to stay locked until the hazard has stopped, use the QSD high-performance or an electromagnetic series.
How many contacts does it have?
Two contacts. For 4- or 6-contact versions see the QSD-K6 / SDP electromagnetic series.
What is the forced release distance?
≥10 mm, so the actuator must be withdrawn at least 10 mm before the contacts are positively opened.
Which actuator shape should I order?
Match the head to the way the door moves: DE-K1 straight for sliding doors, DE-K2 right-angle for hinged doors, DE-K3 / K4 for adjustable and spring-loaded approaches, DE-K5 / K6 for radial and heavy doors. All six fit the same head.
Related products
Need a quotation for QSDP Mechanical?
Send your application details or the guard opening dimensions and we will specify the right model and configuration for your machine.