Press and press-brake guarding
Mounted across the tool area, the curtain drops the stop signal the moment an operator's hand enters the closing zone — with no physical gate to slow the cycle.
Safety Light Curtain · General Type
LE-B Series Safety Light Curtain
A general-purpose through-beam safety light curtain in a 30 × 30 mm profile. With 4–292 beams and protective heights from 70 mm to 2994 mm, the LE-B is the w
Model LE-B Series · Brand LE Raun · Category: Safety Light Curtains
Protective height70–2994 mm
Beam count4–292 beams
Detection distance0.01–3 m / 7 m
Response time≤10 ms
Overview
The LE-B Series is the general-type model in the LE Raun safety light curtain range. Emitter and receiver are housed in a 30 × 30 mm section with a through-beam optical arrangement, so the curtain is aligned across the hazard rather than around it — the simplest and most reliable way to guard a press, a robot cell entry or a packaging line infeed.Every unit is configurable: beam number 4 to 292, protective height 70 to 2994 mm, beam pitch 10, 20, 30 or 40 mm, and a choice of NPN, PNP or relay output. Supply voltage is 10–30 VDC and the response time is ≤10 ms, fast enough for most machine-stop circuits. Protection level is IP65 as standard, with IP67 available for wet or dusty plants.
Application scenarios
Robot cell entry
Guards the load/unload opening of a fenced cell so pallets and fixtures can pass while any person crossing the plane is detected.
Packaging line infeed
Detects hands reaching into the film path or sealing jaw while the line is running.
Palletiser access
Protects the pallet build area where operators step in to correct fallen cases.
Injection moulding door
Guards the mould area when the safety door is open for part removal.
Car stacker and lift entry
Guards the vehicle entrance of a stacker crane bay so the platform cannot move while a person is inside the bay.
Shearing and hydraulic press
Covers the full tool opening of a guillotine or hydraulic press; the ≤10 ms response keeps the stopping distance short.
Robot and manipulator cell
Protects the load/unload aperture of an industrial robot cell while totes and fixtures still pass through.
Industries
- Machine tools
- Automotive
- Packaging
- Electronics
Technical specifications
| Model | LE-B Series |
|---|---|
| Sectional size | 30 × 30 mm |
| Beam number | 4–292 beams (standard) |
| Protective height | 70–2994 mm (standard) |
| Detection distance | 0.01–3 m / 0.01–7 m |
| Beam pitch | 10 / 20 / 30 / 40 mm |
| Supply voltage | 10–30 VDC |
| Signal output | NPN / PNP / Relay (optional) |
| Sync type | Optical / line synchronization (optional) |
| Response time | ≤10 ms |
| Protection level | IP65 / IP67 (optional) |
| Light curtain form | Through-beam type |
| Product application | All kinds of automation equipment, jig equipment, packaging machines, food machinery, 3C semiconductor equipment, photovoltaic equipment, lithium equipment, new energy equipment, medical equipment. |
| Ambient light immunity | Incandescent ≤1000 lux, sunlight ≤10000 lux |
| Circuit protection | Reverse polarity, output short-circuit |
| Power consumption | 3–8 W |
| Operating temperature | −25 to +70 °C operating, −40 to +80 °C storage |
| Max load current | 100 mA (OSSD) |
Dimensions
| Item | Value |
|---|---|
| Beam pitch | 10 mm (max 292 beams) |
| Effective height | beam count × 10 − 10 mm (70 – 2910 mm) |
| Overall length | effective height + 52 mm (lower dead band 37 mm + upper 15 mm) |
| Mounting | Rear T-slot with 2 × M4; M12 connector at one end, 35 mm long |
| Detection distance | 0.01 – 3 m |
The 52 mm added to the effective height is the two end caps — 37 mm below the first beam and 15 mm above the last — so order the beam count for the height you need and the body length follows from it.
Wiring & output
| Lead | Colour |
|---|---|
| 2 | Blue |
| 3 | Black |
| 4 | White |
| 5 | Shield / drain |
How to specify
- 01
Pick the detection capability
Finger protection is Φ15 mm with a 10 mm beam pitch; hand protection Φ25 mm at 20 mm; arm and body detection Φ35 mm at 30 mm; whole-body detection Φ45 mm at 40 mm. The finer the pitch, the closer the operator may stand to the hazard.
- 02
Check how far the hazard is
Where the operator cannot reach the danger zone before the curtain responds, a coarser pitch is acceptable. Where the reach-over distance is short, step down one pitch class — this is the single decision that most often changes the model.
- 03
Choose the profile
30 × 30 mm general-purpose, 35 × 40 mm long range, 32 × 20 mm front slim, 25 × 12 mm front ultra-slim, 10 × 22 mm side ultra-slim, 28 × 28 mm no-blind-zone. The profile is set by the space around the opening, not by the electrical specification.
- 04
Set the protective height
Beam count N and pitch define the effective height: B = N × pitch − pitch. Overall housing length A = B + D + E, where D and E are the lower and upper dead zones including the end caps. Choose the next size up rather than leaving part of the opening unguarded.
- 05
Choose output, sync and connection
NPN or PNP, normally-open or normally-closed, in four combinations. Optical synchronisation needs no link wire (5-wire); line synchronisation is immune to cross-talk between adjacent curtains (7-wire). Cable gland or M12 connector at order.
- 06
Confirm the working distance
Standard series align over 0.1–8 m; the long-range series reaches 25–30 m. Check the emitter/receiver pairing table before ordering a mixed set — not every series can be cross-paired.
Why this series
Rugged 30 × 30 mm profile
A stiff aluminium section that mounts straight onto machine frames and tolerates the vibration of press-fed and indexing equipment.
Sized to the opening
Pick any beam count from 4 to 292; protective heights run from 70 mm up to 2994 mm so guarding and access points can be matched exactly.
Three output options
NPN, PNP or relay output — one curtain family fits PLC inputs, safety relays and direct contactor control.
Questions
How do I choose between 4 and 292 beams?
Match the protective height to the opening you are guarding (70–2994 mm), then choose the beam pitch for the object size you need to detect: 10, 20, 30 or 40 mm. A finer pitch resolves smaller objects but needs more beams for the same height.
Optical or line synchronization — which one?
Both are available as options. Optical synchronization removes the sync wire between emitter and receiver, which simplifies cable routing across wide openings; line synchronization uses a dedicated sync line and is the conventional choice for short, fixed installations.
Is IP67 available?
Yes. IP65 is the standard protection level and IP67 is available as an option for wash-down or high-dust environments.
Which output type suits my control panel?
NPN and PNP are transistor outputs for PLC or safety-relay inputs; the relay version provides volt-free contacts for direct switching. All three are optional configurations of the same unit.
What length do I order for a 900 mm opening?
Take the next protective height that covers the opening: on a 20 mm pitch that is 46 beams (46 × 20 − 20 = 900 mm). The housing is then 900 mm plus the two dead zones, so plan the bracket space from the drawing, not from the protective height alone.
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Need a quotation for LE-B Series?
Send your application details or the guard opening dimensions and we will specify the right model and configuration for your machine.