Retrofit guarding
Adds a latch to an existing door so an interlock can be fitted.
Guard Door Hardware · Safety door latch
QSD-AQMS-K4-L2 Safety Door Latch
A lever-action safety door latch that holds a guard door closed and provides the mounting point for an interlock actuator on retrofits and fabricated guards.
Model QSD-AQMS-K4-L2 · Brand LE Raun · Category: Safety Door Locks & Interlocks
TypeLever-action latch
MountingSurface, bracket
UseGuard door holding
ModelQSD-AQMS-K4-L2
Overview
Many guard doors are fabricated on site and arrive without a latch. The QSD-AQMS-K4-L2 gives them one: a lever-action latch that holds the door closed and provides a stable mounting point for the interlock actuator, so the switch is not trying to hold the door as well as monitor it.It is a mechanical accessory rather than a monitored device — the safety function comes from the interlock switch it carries. Detailed dimensional drawings and load figures are available on request.
Application scenarios
Fabricated guards
Site-built enclosures that arrive without door hardware.
Light doors
Holds a light guard closed where a full locking interlock is not required.
Maintenance access panels
Provides a repeatable closing position for the actuator.
Special-purpose machines
One-off builds where standard door hardware does not fit.
Industries
- Machine tools
- General machinery
- Automotive
- Injection moulding
Technical specifications
| Model | QSD-AQMS-K4-L2 |
|---|---|
| Function | Holds the guard door closed; carries the interlock actuator |
| Mounting | Surface-mounted bracket, lever action |
| Compatible with | QSD / QSDP interlock switches |
| Product application | Guard doors on machine tools, injection-moulding equipment and special-purpose machines where the door has no built-in latch. |
| Housing material | Flame-retardant thermoplastic (metal body on the high-performance series) |
| Contact material | Silver alloy |
| Contact resistance | ≤25 mΩ |
| Rated insulation voltage | 500 V |
| Rated impulse withstand | 4 kV |
| Utilisation category | AC-15 / DC-13 |
| 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 |
|---|---|
| Hole spacing | 292.50 mm between the two end holes |
| Slot | 10.5 mm wide, 6.5 mm deep for the latch tongue |
| Lock body | ≈ 107 × 66 × 50 mm |
| Holding force | 2000 N, with solenoid lock |
The 330 mm rail is the part that spans the door frame, and the 292.50 mm hole spacing is what fixes it — the latch body itself is the 107 mm block that bolts to the door and engages the slot.
Wiring & output
| Lead | Function |
|---|---|
| Door-position NO | Confirms the lever is latched |
| Interlock NC × 2 | Carried through the QSD / QSDP actuator on the lever |
How to specify
- 01
Decide whether the door needs to be locked
A plain lever latch only holds the door closed — the safety function comes from the interlock switch on it. Choose the solenoid variant only where the guard must stay latched until a dangerous motion has run down.
- 02
Match the latch to the interlock
The QSD-AQMS-K4-L2 is the carrier for the standard QSD / QSDP actuator; confirm the actuator key shape (DE-K1–K6) at the same time, because the lever has to clear it.
- 03
Check the holding force against the door
The lever latch is for light to medium guard doors; a heavy sliding guard or a door with a long lever needs a full locking interlock, not a latch.
- 04
Allow for the lever arc
The lever swings through an arc to release — leave the clearance the drawing shows, or the lever binds and the interlock actuator wears.
Why this series
Holds the door, not the switch
Takes the door load off the interlock actuator so the switch only has to sense position.
Retrofit friendly
Surface-mounted bracket for fabricated guards that were built without a latch.
Pairs with QSD / QSDP
Designed as the carrier for the standard interlock actuator.
Questions
Is the latch monitored?
No. It is a mechanical latch; the safety function is provided by the interlock switch mounted on it.
Does it fit QSD and QSDP switches?
Yes, it is designed as the actuator carrier for the standard QSD and QSDP interlocks. Confirm the exact actuator for your switch when ordering.
Are drawings available?
Dimension drawings and load data are available on request — the catalogue lists the model only.
Related products
Need a quotation for QSD-AQMS-K4-L2 Safety?
Send your application details or the guard opening dimensions and we will specify the right model and configuration for your machine.