Swinging guard doors
L-shaped and long L keys follow the arc of a hinged door.
Guard Door Hardware · Actuation keys
DE-K Series Actuation Keys
Six actuator key shapes for the QSD / QSDP interlock range — T-shaped, L-shaped, long-throw and adjustable versions, so the key can follow the door's closing
Model DE-K1 … DE-K6 · Brand LE Raun · Category: Safety Door Locks & Interlocks
Types6 shapes
UseActuator / spare
AdjustmentHorizontal / vertical
MaterialStainless steel
Overview
The key is the part that decides whether an interlock works reliably. A door that swings through an arc needs an L-shaped or adjustable key; a sliding door needs a straight T; a door that settles over time needs the adjustable version so the key can be trimmed back into tolerance instead of the switch being re-shimmed.Six shapes cover the range, including long-throw versions for doors with a deep frame and a fully adjustable key that moves in two axes. Keys are also stocked as spares — a bent key is the most common cause of a guard door that will not reset.
Application scenarios
Sliding doors
T-shaped keys engage squarely as the door closes.
Doors that settle
Adjustable keys compensate for hinge wear over time.
Deep frames
Long-throw keys reach across a thick door frame.
Spares and maintenance
Replace a bent key instead of re-aligning the switch.
Industries
- Machine tools
- General machinery
- Injection moulding
- Packaging
Technical specifications
| Model | DE-K1 … DE-K6 |
|---|---|
| Type | Actuation key (actuator) for QSD / QSDP interlocks |
| Variants | T-shaped · L-shaped · long T · long L · horizontally adjustable · horizontally and vertically adjustable |
| Function | Transmits the door position to the interlock switch |
| Compatible with | QSD and QSDP safety interlock switches |
| 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 |
|---|---|
| Mounting | 2 × M4 on 22 / 20 mm centres — matches the QSDP head |
| Key face | 30.5 mm, the head entry dimension |
| Minimum door radius | R ≥ 150 mm for hinged doors |
The keys are the consumable half of the QSDP interlock — the 22 / 20 mm hole pattern is the same as the switch head, so a replacement key drops onto the existing door mounting without redrilling.
Wiring & output
| Model | Shape |
|---|---|
| DE-K2 | L-shaped |
| DE-K3 | Long T-shaped |
| DE-K4 | Long L-shaped |
| DE-K5 | Horizontally adjustable |
| DE-K6 | Two-axis adjustable |
How to specify
- 01
Match the key shape to the door motion
A sliding door that closes square takes a T (DE-K1). A hinged door that swings takes an L (DE-K2) so the key follows the arc instead of binding in the head.
- 02
Take the long version for a deep frame
DE-K3 / K4 add reach for doors whose frame is thicker than the standard key length — measure the frame before ordering, because a key that is too short never enters the head.
- 03
Choose adjustable where the door will settle
DE-K5 trims horizontally, DE-K6 in both axes. Use them on doors with hinge wear or on guards that are hard to align, so the key is trimmed back into tolerance instead of the switch being re-shimmed.
- 04
Order spares with the switches
Keys are damaged in use far more often than the switch itself — a spare DE-K of the right shape is the fastest fix for a door that will not reset.
Why this series
Six shapes
T, L, long T, long L, horizontally adjustable and two-axis adjustable.
Adjustable versions
Take up door sag without moving the switch.
Spare part availability
The usual fix for a door that stops resetting after an impact.
Questions
Which key shape do I need?
Match it to the door motion: T for sliding doors, L for hinged doors, long versions for deep frames, adjustable versions where the door position drifts.
Are keys sold separately?
Yes — keys are available as spare parts, which is the usual fix when a door stops resetting after a knock.
Do the keys fit all QSD switches?
They are the standard actuator family for the QSD and QSDP interlocks; confirm the matching key with the switch model when ordering.
Need a quotation for DE-K Series?
Send your application details or the guard opening dimensions and we will specify the right model and configuration for your machine.