Manual restart after access
The machine waits for a deliberate start command once the field is clear — the default where an operator steps inside the guarded area.
Safety Relay · Manual Start
LE-S3012N Safety Relay Module (Manual Start)
A dual-channel safety relay module for light curtain input, category 4 to EN ISO 13849-1 and safety level 3 to IEC 61508 / IEC 62061. Manual start version, 2
Model LE-S3012N · Brand LE Raun · Category: Safety Relay Modules
Safety category4 (EN ISO 13849-1)
Safety level3 (IEC 61508/62061)
Start-up modeManual start
Protection levelIP40 (terminals IP20)
Overview
The LE-S3012N is a dual-channel safety relay module for use with safety light curtains. It carries safety category 4 to EN ISO 13849-1 and safety level 3 to IEC 61508 / IEC 62061, and is built to EN ISO 13849-1, EN ISO 13849-2, EN 62061, IEC 61508 and IEC 62061.This is the manual start version: after the light curtain field is cleared the machine needs a separate start command. Module consumption is ≤2 W at 24 V DC, the output is protected by a built-in resettable fuse, minimum permissible load is 10 V DC / 10 mA, rated insulation voltage 300 V AC, and mechanical durability is ≥5,000,000 cycles. Operating range is −10 to +55 °C, non-condensing, in an IP40 (terminals IP20) housing.
Application scenarios
Robot cell load/unload
Prevents the cell restarting while a person is still at the fixture.
Press with manual restart
Interfaces a light curtain to a press control circuit with a supervised restart.
Retrofit of older machines
Adds a monitored dual-channel relay stage to a machine that has none.
Guarded test stations
Where an engineer works inside the guard during setup.
Industries
- Machine tools
- Automotive
- Robotics
- Packaging
Technical specifications
| Model | LE-S3012N |
|---|---|
| Start-up mode | Manual 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 |
The 23 mm is the rail width — one slot — so a bank of these sits side by side without wasting panel space; the manual start is what makes it the choice for guarding that must be reset by an operator.
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
What does “manual start” mean?
The relay requires a deliberate start action after the protective field is cleared, rather than restarting the machine automatically. This is the usual choice where an operator stands inside the guarded area during setup.
Can it monitor an emergency stop as well?
The module performs dual-signal monitoring for emergency stop and safety switches on machinery and machine tools, and is intended for safety light curtain input.
What supply does it need?
24 V DC, with ≤2 W module power consumption and a built-in resettable fuse on the power supply and output.
Need a quotation for LE-S3012N Safety?
Send your application details or the guard opening dimensions and we will specify the right model and configuration for your machine.