Siemens 3SE5112-0CH50 Limit Switch

Series: SIRIUS 3SE5 mechanical position limit switch (standard position switch, NOT positive-opening safety switch)

✅ Model Code Explanation

3SE5: SIRIUS family of mechanical position switches

3SE51: Metal enclosure, 40mm width, compliant with EN 50041

12: 1NO + 1NC snap-action contacts

0CH50: Adjustable-length metal lever with φ19mm plastic roller; rotary actuator reversible for left/right mounting

📋 Core Technical Specifications

📌 Product Features

1. Modular construction: Composed of base housing, contact module, rotary actuator head and adjustable lever. Components can be replaced individually. Part numbers: Base 3SE5112-0CA00, actuator head 3SE5000-0AH00, lever 3SE5000-0AA50, contact block 3SE5000-0CA00
2. Bidirectional reversal: Rotary head can be switched left or right to adapt to forward/reverse stroke triggering of equipment
3. Adjustable lever length, convenient for fine-tuning trigger position on site
4. Impact-resistant metal housing, suitable for machine tools, conveyor lines and automation sites
5. ⚠️ Important Notice: No positive opening function. NOT permitted for safety protection circuits (e.g. safety gate interlock). Only for general position detection, travel limit and home position feedback signals.

🛠️ Typical Application Scenarios

Conveyor travel limit, machine tool stroke limit, automation frame position detection, mechanical trigger for silo material level, general position feedback of doors (non-safety interlock)

🔁 Substitute & Selection Reference

Same series alternative (different actuator): 3SE5112-0CH01 (fixed-length lever)

Domestic alternative reference: Delixi, Chint, Omron WL series roller lever limit switches (verify contact capacity, mounting dimensions and protection rating)

Model for safety applications: 3SE53xx series (positive-opening safety switches)

⚠️ Installation & Maintenance Notes

1. Mounting holes comply with EN50041 standard; reserve buffer stroke for the lever to prevent roller damage from impact
2. Properly seal the M20 cable gland to maintain IP67 protection
3. Snap-action contacts are not suitable for high-frequency low-level signals; intended for power-type switching signals
4. Periodically inspect lever wear and screw tightness; worn rollers allow replacement of actuator assembly alone, full switch replacement unnecessary

Application Scenarios of Siemens 3SE5112-0CH50

⚠️ Important Premise: Standard position switch without positive-opening contacts. Cannot be used for safety gates, safety circuits or emergency stop safety interlock. Only for general position feedback, travel limit and process trigger signals. IP66/IP67, metal housing with adjustable lever, suitable for dusty and humid industrial environments.

1. Conveyor & Logistics Automation (Most Common)
2. Belt / roller conveyors: Hard mechanical limit at head and tail to prevent trolley/stop block overtravel; position signal sent to PLC for deceleration, stop and direction change
3. Transfer carts, shuttle trolleys: Home position locating and end-position detection
4. Sorting & packaging lines: Box-in-place trigger, stop plate position feedback
5. Lifts & vertical conveying equipment: Upper/lower limit signals for lifting platforms (general limit only; separate safety switch required for safety protection circuit)
6. Machine Tools & Processing Equipment
7. CNC machines, machining centers: Hard mechanical limit for worktable slides and saddles (backup for soft limit), travel end detection for X/Y/Z axes
8. Press brakes, shears: Slide / material rack in-position signal and stroke end feedback (not for safety protection)
9. Woodworking machinery, grinders: Mobile worktable in-position detection and process switching trigger signals

III. Custom Automation & Assembly Equipment

1. Jigs & fixtures: Clamp closed/open position feedback
2. Servo slides, cylinder-driven mechanisms: Mechanical end limit and home position confirmation
3. Tooling around robots: Silo baffle and discharge mechanism position detection

Advantage: 0~100mm adjustable lever length, reversible actuator head for easy on-site fine-tuning of trigger position

1. Material Storage & Silo Applications
2. Silo gates, flap valves: Full-open / full-closed position feedback
3. Warehouse mechanical level detection: Material push plate in-position detection
4. Lifting, Door & Construction Machinery (General Position Signals)
5. Overhead cranes, small hoists: General travel limit for cross/longitudinal carriages (safety ultimate limit must use safety-type switches)
6. Factory motorized sliding doors, roller shutters: Full-open / full-closed position feedback (non-safety interlock)
7. Hydraulic / pneumatic actuators: Cylinder end position detection
8. Other General Industrial Applications

Printing & textile machinery: Roller frame and moving frame stroke detection

Water treatment & environmental equipment: Baffle and discharge mechanism position signals

General position indication for equipment access doors (⚠️ NOT for safety interlock door switches; safety gates require 3SE53xx positive-opening safety switches)

✅ Selection Checklist (Pitfall Avoidance)

1. Adjustable metal lever + φ19 plastic roller, suitable for lateral impact from moving stop blocks; long lever preferred where installation space is ample and trigger position fine adjustment is required
2. 1NO+1NC snap-action contacts for PLC DI position signals, AC15/DC13 24V 3A
3. Environmental suitability: -25℃~+85℃, IP67, impact-resistant metal housing, ideal for dusty and humid workshops
4. ❌ Forbidden applications: Safety gate interlock, emergency stop safety circuits, ISO13849 safety-related circuits (use 3SE53xx positive-opening safety position switches for these cases)

Voltage Parameters of Siemens 3SE5112-0CH50

This is a mechanical limit switch with no internal power supply required, it is merely passive contacts. Below are the permissible rated switching voltages for contacts:

1. Rated Insulation Voltage Ui: 400V (maximum withstand voltage)
2. AC-15 AC Operating Voltage (inductive load)

24V AC / 125V AC / 240V AC / 400V AC

400V AC: 4A; 24/125/240V AC: 6A

3. DC-13 DC Operating Voltage (inductive load, most common for PLC DI)

24V DC: 3A (widely used for PLC digital input)

125V DC: 0.55A

250V DC: 0.27A

400V DC: 0.12A

✅ Engineering Selection Notes

PLC DI digital signal: DC24V, fully compatible, the most common usage of this model

Also applicable for AC220V circuits to switch high-power loads

Passive dry contacts, no power supply needed for the switch body

Mounting Dimensions of Siemens 3SE5112-0CH50 (EN50041 40mm Metal Housing)

Reference: Siemens original datasheet; dimensions separated for housing without lever and full assembly with lever

1. Outer Housing Dimensions (excluding lever)

Width: 40.5 mm

Height: 85.7 mm

Depth: 37.3 mm

2. Mounting Fixing Holes (critical hole dimension, EN50041 standard)

Vertical center distance between two fixing holes: 61 mm

Mounting hole diameter: 5.3 mm (suitable for M5 bolts)

Distance from hole to side edge: 12.5 mm

Mounting orientation optional, 4 mounting holes (2 top, 2 bottom). Standard 40mm footprint, mounting holes fully interchangeable for all 3SE51xx base units.

3. Actuator Lever Dimensions (adjustable metal lever + φ19 roller)

Roller diameter: φ19 mm (plastic roller)

Lever adjustment range: Min 44 mm, Max 109 mm (from rotary head center to roller center)

Overall maximum total length with lever fully extended: 192 mm

Actuator head reversible 180° left/right

4. Cable Entry

Single cable entry: M20×1.5

5. Key Engineering Remarks
6. Mounting plate cutout: Fixing hole center distance 61mm, hole φ5.3, fasten with M5 bolts
7. Adjustable lever: Reserve sufficient buffer stroke. Stop block impact direction must be perpendicular to roller; do not forcibly bend laterally to avoid shaft damage
8. Housing depth 37.3mm; reserve space for rear cover and cable gland during backplate mounting; M20 gland exits from bottom of housing
9. Base mounting holes common across 3SE51xx series; no re-drilling required when replacing actuator head