Schmersal BN310-01Z Magnetic Safety Switch

Basic Information

1. Brand & Origin: SCHMERSAL, Germany
2. Full Model No.: BN 310-01Z
3. Factory Order Codes:

1m standard cable version: 101133844

BN310-01Z 3.0m cable version: 101180919

4. Product Type: Single Normally Closed (NC) Reed Magnetic Proximity Switch (Safety Door Magnetic Switch)
5. Operating Principle: Contact-free magnetic actuation with hermetically sealed reed contacts; used with dedicated magnetic actuators
6. Core Electrical & Mechanical Specifications

2.1 Contact Ratings

Contact Configuration: 1 Normally Closed contact (01Z = single NC)

Max Switching Voltage: AC250V / DC250V

Max Switching Current: 3A

Rated Switching Power: 120VA (AC) / 120W (DC)

Operate/Release Delay: 0.3~0.6ms; Max Switching Frequency: 300Hz

Mechanical Service Life: ≥1 billion switching cycles

2.2 Overall Dimensions & Wiring

Housing Dimension: 88mm (L) × 25mm (W) × 13mm (T)

Cable Spec: 2-core PVC cable H03VV-F, cross-section 0.75mm²

Standard Cable Length: 1m; Optional extended lengths: 3m/5m/10m

Housing Material: Glass-fiber reinforced thermoplastic, slim flat design

Net Weight: 75g

2.3 Environmental Protection & Operating Conditions

Protection Class: IP67 (dust-tight, protected against splashing water, suitable for dusty & humid workstations)

Operating Temperature Range: -25℃ ~ +75℃

Vibration Resistance: 10~55Hz, amplitude 1mm; Shock Resistance: 30g/11ms

Actuation Mode: Side magnetic sensing; Effective sensing distance: 3~60mm (depends on matched actuator model)

Repeat Positioning Accuracy: ±0.3mm

2.4 Certifications

CE, cULus; Compliant with EN IEC 60947-5-2; Special certification for elevator industry

3. Model Code Explanation

BN310 01 Z

BN310: Slim flat reed switch series

01: 1 contact set

Z: Normally Closed (NC) contact output

Same Series Comparison

BN310-01Z: Single NC (widely used for safety circuits)

BN310-10Z: Single Normally Open (NO)

BN310-RZ: Changeover contact (1NO+1NC)

4. Wiring Definition (2-core cable)

S/rd Red Wire: One terminal of reed contact

N/gn Blue Wire: The other terminal of reed contact

Circuit Logic:

Magnet approaches → Contact closes; Magnet moves away → Contact opens (NC safety circuit cuts off, machine stops)

5. Typical Application Scenarios
6. Position monitoring for safety guard doors & protective covers on machine tools and automated production lines
7. Car door / landing door position detection for elevators (compliant with original elevator standards)
8. Safety door interlock monitoring for packaging machinery, injection molding machines and conveyors
9. Contact-free position signal collection for small equipment cabinet doors and safety shields

Advantages: No mechanical wear, oil & splash water resistant, ultra-long service life, compact mounting footprint

6. Matching Accessories & Selection Guidelines
7. Only SCHMERSAL original BN-series magnetic actuators (BP10N/BP10S etc.) are allowed; generic magnets cause unstable sensing distance
8. IP67 rating tolerates washdown environments, yet permanent submersion is prohibited; install away from strong electromagnetic interference sources
9. Safety circuit applications are recommended to be wired in series with safety relays to meet machinery safety standards
10. Alternative Models within the Series

Compact short-distance variant: BN20 series

Changeover contact solution: BN310-RZ

Extended cable options: BN310-01Z 3M/5M/10M

SCHMERSAL BN310-01Z Magnetic Safety Switch Installation Manual

Document Information

Model: BN310-01Z (1NC single normally closed reed magnetic switch)

Factory Standards: EN IEC 60947-5-2, EN 1088 safety door standard

Applicable Equipment: Machine tool safety doors, elevator landing/car doors, automated machinery guard interlocks

Target Users: Qualified electrical engineers, equipment installation & maintenance technicians

1. Mandatory Pre-Installation Safety Rules
2. Electrical Safety

All wiring, disassembly and assembly work must be performed with full power cut off; hot plugging of cables is strictly forbidden. Safety circuits shall be paired with SCHMERSAL SRB/AES series safety relays to fulfill safety monitoring requirements.

2. Mandatory Use of Original Accessories

Only SCHMERSAL original BP-series magnetic actuators (BP10/BP15/BP20/BP31/BP34/BP21) are permitted. Generic high-strength magnets lead to false switching, degraded precision and drastically shortened service life.

3. Material Restrictions for Mounting Surfaces

Switch and actuators shall not be mounted directly on ferromagnetic steel plates. For steel mounting bases, non-ferromagnetic spacer pads with thickness ≥20mm (plastic/aluminum/copper) must be fitted; otherwise sensing distance will be severely reduced.

4. Tamper-Proof Requirements

For safety door applications, anti-torx security screws shall be used to prevent intentional short-circuiting of safety circuits. The switch and actuator shall never serve as mechanical limit stops to avoid housing cracking under compression.

5. Environmental Limits

Operating temperature: -25℃ ~ +75℃; IP67 protection withstands splash washing, permanent submersion is prohibited. Keep clear of high EMI sources such as inverters, high-power contactors and electromagnets.

2. Product Specifications & Dimensions

2.1 Switch Body Parameters

Profile: Flat housing 88mm (L) × 25mm (W) × 13mm (T)

Mounting Structure: Slotted long holes on top & bottom housing for fine adjustment of sensing distance forward/backward

Cable: 2-core H03VV-F PVC cable, 0.75mm² cross-section; standard 1m, optional 3/5/10m

Cable Color Definition: Red = S, Blue = N (two terminals of NC reed contact)

Contact Capacity: AC250V/3A, 120VA; DC250V/3A, 120W

Repeat Positioning Accuracy: ±0.3mm; Mechanical Life ≥1 billion cycles

2.2 Standard Sensing Distance Sn for Matched Actuators

3. Step-by-Step Mechanical Installation Procedures

Step 1: Mounting Position Planning

1. Fix the switch to stationary machine frames, mount the actuator on movable guard doors/covers. Side-by-side parallel actuation required: the sensing face of the housing must align flat against the actuator surface.
2. Maintain minimum spacing ≥50mm between multiple BN310 switches on one cabinet to avoid mutual magnetic interference and false triggering.
3. Mounting surfaces must be flat without burrs or protrusions to prevent housing deformation under stress.

Step 2: Fitting Isolation Spacers (Mandatory for Steel Frames)

Steel frame → ≥20mm non-ferromagnetic spacer pad → BN310 switch body; fit identical spacers between steel door panels and actuators. Direct mounting without spacers is allowed for aluminum, stainless steel or plastic frames.

Step 3: Securing the Switch Body

1. Thread M3/M4 screws through slotted mounting holes and fasten loosely without full tightening.
2. Fully close the guard door, bring the actuator close to the switch sensing face and set the nominal gap per actuator model.
3. When the door is fully closed, the actuator must stay within rated sensing range; when fully open, separation distance must exceed maximum release distance to guarantee reliable contact opening.
4. Adjust position via slotted holes, test switching logic, then fully tighten screws diagonally with torque 0.8~1.2N·m; over-tightening that crushes the housing is forbidden.

Step 4: Actuator Mounting & Alignment Calibration

1. Actuator surface must run perfectly parallel to switch sensing face; tilting over 10° causes complete failure.
2. With door closed, actuator center must align with switch sensing zone center, vertical offset ≤3mm.
3. Ensure no collision or friction between cables and switch during full door travel; reserve cable slack to avoid tension when the door opens to maximum angle.

Step 5: Cable Routing & Protection

1. Route cables inside cable ducts or corrugated tubes to prevent sheath damage from sharp edges.
2. Minimum cable bending radius ≥5× outer cable diameter; sharp right-angle folds are prohibited.
3. Leave slack at cable entry to avoid tension pulling the switch; fit cable sleeves for workstations with cutting fluid or heavy oil contamination.
4. Electrical Wiring Specifications

4.1 Core Wire Definition

BN310-01Z is a passive reed switch with single NC two-wire contacts, no auxiliary power supply required:

Red wire S: First contact terminal

Blue wire N: Second contact terminal

4.2 Circuit Logic

Guard door closed (actuator in position): Contact closed, circuit conductive

Guard door open (actuator separated): Contact open, safety circuit interrupted, machine shuts down

4.3 Three Standard Wiring Schemes

Scheme 1: Safety Relay Safety Circuit (Recommended for Machine Tools & Elevators)

Wire all BN310-01Z switches in series and connect to the input circuit of SRB safety relays:

Power supply AC230V / DC24V → Series-connected red-blue wires of all switches → Safety relay input terminals

Opening any guard door breaks the circuit; safety relay cuts output to main contactors.

Scheme 2: PLC Digital Input (Passive Dry Contact)

For NPN sink-type PLC:

DC24V+ → Switch red wire; Switch blue wire → PLC digital input terminal X; PLC common COM terminal connected to 0V

Door closed: Input channel energized and indicator lit; Door open: Input channel de-energized.

Scheme 3: Auxiliary Control Relay Circuit

AC220V Live Line → Switch red wire; Switch blue wire → Relay coil; Coil opposite terminal connected to Neutral Line

Door closed: Relay coil energized; Door open: Relay coil de-energized.

4.4 Wiring Prohibitions

1. Do not exceed rated load AC250V/3A; never drive high-power contactors directly.
2. Avoid routing control cables parallel with inverter power cables in the same duct; electromagnetic interference causes intermittent disconnection.
3. Strip wire insulation length limited to 3~5mm; prevent stray copper strands from short-circuit; fully tighten terminal lugs to avoid overheating.
4. Mandatory Post-Installation Commissioning Tests
5. Power-Off Continuity Test

Set multimeter to continuity mode and connect probes to red & blue wires. Continuity alarm sounds when door closed (actuator adjacent); no continuity signal when door fully open — logic confirmed normal.

2. Gap Limit Test

With door closed, shift actuator ±2mm within nominal sensing range while maintaining continuity. Gradually pull actuator away beyond rated Sn; contact must open reliably without hysteresis sticking.

3. Full Stroke Opening/Closing Cycle Test

Open and close the door repeatedly for 50 cycles; verify no random disconnection or jamming; inspect cables for tension or abrasion.

4. Electromagnetic Interference Test

Power on full machine, start/stop inverters and contactors; confirm no unexpected disconnection of the switch. If false triggering occurs, increase separation between control and power cables or install shielded ducts.

6. Fault Troubleshooting Matrix

7. Maintenance & Disassembly Procedures
8. Regular Maintenance Cycle

Dusty/oily workstations: Monthly inspection

Clean dry workshops: Quarterly inspection

Inspection items: Screw tightness, cable sheath integrity, metal debris clearance on sensing surface.

2. Disassembly Process

Cut full machine power → Disconnect cable terminals inside control cabinet → Loosen mounting screws → Remove switch and actuator; never pull cables orcefully to extract components.

3. End-of-Life Disposal

Dispose as electronic & electrical waste per local regulations; discontinue use immediately if internal glass reed tube cracks.

8. Strict Installation Forbidden Operations
9. Using generic third-party magnets instead of SCHMERSAL original BP-series actuators
10. Direct mounting on steel surfaces without non-ferromagnetic isolation spacers
11. Mounting actuator tilted at an angle relative to switch sensing face
12. Sharp hard bending or permanent tension applied to cables
13. Performing wiring/disassembly with power live
14. Spacing between multiple switches less than 50mm
15. Using switch/actuator as mechanical stop bearing impact loads
16. Connecting safety circuits directly to main power circuits without safety relay supervision
17. Original Factory Matching Order List
18. BN310-01Z switch body (1/3/5/10m cable options; standard 1m order code: 101133844)
19. Matching magnetic actuators: BP10 / BP15 / BP20 as required
20. Mounting accessories: 20mm plastic isolation spacers, M4 anti-torx security screws, cable corrugated tubes
21. Supporting safety relays: SRB300, AES1235