Enclosed cells
Restarts automatically when the light curtain is clear and no one can be inside — no operator action needed.
Safety Relay · Auto Start
LE-S3012P Safety Relay Module (Auto Start)
The auto-start version of the LE-S3012 safety relay: category 4 to EN ISO 13849-1, safety level 3 to IEC 61508 / IEC 62061, 24 V DC, ≤2 W, IP40 (terminals IP
Model LE-S3012P · Brand LE Raun · Category: Safety Relay Modules
Safety category4 (EN ISO 13849-1)
Safety level3 (IEC 61508/62061)
Start-up modeAuto start
Protection levelIP40 (terminals IP20)
Overview
The LE-S3012P is the auto-start variant of the LE-S3012 safety relay. With the protective field clear, the module re-enables the output without a separate start command — appropriate for enclosed cells where access while running is impossible.Its safety data is identical to the manual-start version: category 4 to EN ISO 13849-1, safety level 3 to IEC 61508 / IEC 62061, conformity to EN ISO 13849-1, EN ISO 13849-2, EN 62061, IEC 61508 and IEC 62061. Supply 24 V DC with ≤2 W consumption and a built-in resettable fuse; minimum load 5 V DC / 10 mA; rated insulation voltage 300 V AC; IP40 (terminals IP20); −10 to +55 °C, non-condensing.
Application scenarios
Conveyor transfer points
No manual reset for a transfer opening that is only crossed by product.
Palletiser openings
The cell resumes as soon as the load has passed the plane.
High-cycle machines
Automatic restart keeps cycle time down where access is impossible while running.
Automated assembly
Interfaces the curtain to a PLC sequence with automatic re-enable.
Industries
- Logistics
- Packaging
- Automotive
- Electronics
Technical specifications
| Model | LE-S3012P |
|---|---|
| Start-up mode | Auto start |
| Compliant standards | EN ISO 13849-1 · EN 62061 · EN ISO 13849-2 · IEC 61508 · IEC 62061 |
| Corresponding safety category | SIL 3 / PL e (Cat. 4); SIL 2 / PL d (Cat. 3) on reduced configs |
| Safety level | 3 (IEC 61508 / IEC 62061) |
| Module power consumption | ≤2 W (at 24 V DC) |
| Power supply & output protection | Built-in power protection |
| Minimum permissible load | 10 V DC / 10 mA |
| Rated insulation voltage | 300 V AC (reinforced / double insulation) |
| Vibration resistance | 10–55 Hz, single amplitude 0.35 mm |
| Protection level | IP40 (terminals IP20) |
| Mechanical durability | ≥5,000,000 cycles |
| Operating ambient temperature | −10 to +55 °C (non-condensing) |
| Product applications | Suitable for safety light curtain input. Performs dual-signal monitoring for emergency stop and safety switches on machinery and machine tools. |
| Standards | EN ISO 13849-1:2015, EN ISO 13849-2:2012, EN 62061:2015 |
| Performance level | PLe / SIL 3, Category 4 architecture |
| Safety outputs | 3 NO contacts (13–14, 23–24, 33–34) |
| Signal output | 1 transistor output (41–42) |
| Contact rating | AC-15 3 A / 240 VAC, DC-13 1 A / 24 VDC |
| Conventional thermal current | 6 A |
| Contact material | AgSnO₂ with 2 µm Ag plating, silver-alloy contacts |
| Contact resistance | ≤100 mΩ |
| Electrical life | 100,000 operations |
| Mechanical life | ≥5,000,000 operations |
| Operating frequency | 0.5 Hz |
| Release time | ≤10 ms after power-off (status-LED delay excluded) |
| Rated impulse withstand | 2,500 V (1.2/50 µs) |
| Terminals | Removable blocks, 2 × 1.5 mm² solid or 2 × 1 mm² stranded |
| Mounting | 35 mm DIN rail |
| Indication | 3 green LEDs — power, channel 1, channel 2 |
Dimensions
| Item | Value |
|---|---|
| Height | 114.5 mm |
| Depth | 23 mm |
| Enclosure | IP40, DIN-rail module |
| Weight | approx. 230 g |
Same 23 mm housing as the S3012N; the only functional difference is the auto start, so it is used where the guarded process resumes on its own once the field is clear.
Wiring & output
| Terminal | Function |
|---|---|
| S11 / S12 | Safety input, channel 1 — light curtain OSSD or first contact of a two-channel device |
| S21 / S22 | Safety input, channel 2 — second channel for dual-channel devices |
| 13–14 | Safety output 1, NO, closed when both channels are healthy |
| 23–24 | Safety output 2, NO |
| 33–34 | Safety output 3, NO |
| 41–42 | Transistor signal output for the PLC (state mirror) |
| SB1 / SB2 | Start / reset button, and two-hand control inputs on the two-hand module |
| KM1 / KM2 | External contactor feedback (EDM) — opens the enable path if a contactor welds |
How to specify
- 01
Count the safety outputs
Every module has three NO safety outputs and one transistor signal output. Two outputs normally go to the two contactors of the main circuit, the third can report to the PLC or drive a second axis.
- 02
Match the start mode to the risk assessment
Manual start needs a deliberate reset after the field is clear; automatic start re-enables as soon as the field is clear and is only allowed where the operator cannot stand inside the guarded area. The two-hand module additionally requires both buttons within 0.5 s.
- 03
Check the contact rating against the contactors
3 A / 240 VAC is enough for the coil of a 24 VDC contactor but not for a large AC coil — use an interposing contactor or a force-guided pair.
- 04
Wire the feedback loop
The EDM input must see the NC auxiliary contacts of both switching contactors, otherwise a welded contact will not be detected and the module cannot reach Category 4.
Why this series
Category 4 architecture
Corresponding safety category 4 to EN ISO 13849-1, with safety level 3 according to IEC 61508 / IEC 62061.
Protected output
Built-in resettable fuse protects the power supply and the output circuit — no replaceable fuse to stock.
DIN-rail module
A compact housing for standard cabinet mounting, rated IP40 (terminals IP20) for installation inside an enclosure.
Questions
When should I choose auto start?
Where the machine is allowed to restart as soon as the protective field is clear and no operator can be inside it — for example a fully enclosed cell with no manual load position. Manual start (LE-S3012N) is the safer default where people reach in.
Are the electrical ratings the same as the N version?
Yes. Both share the same specification: 24 V DC, ≤2 W, 10 V DC / 10 mA minimum load, 300 V AC rated insulation voltage, IP40 (terminals IP20) and ≥5,000,000 mechanical cycles. Only the start-up mode differs.
How is it mounted?
The module is designed for installation inside a control cabinet; IP40 (terminals IP20) applies to the enclosure-mounted unit.
Need a quotation for LE-S3012P Safety?
Send your application details or the guard opening dimensions and we will specify the right model and configuration for your machine.