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BNS-B20-12Z-ST-L - Non-Contact Magnetic Interlock - SS IP67 SIL2 Industrial Safety Switch
| MOQ: | 1 |
| Price: | USD 100-10000/Piece |
| Standard Packaging: | 50*50*50mm |
| Delivery Period: | 3-7 |
| Payment Method: | T/T |
| Supply Capacity: | 1/piece in stock |
Non-contact magnetic interlock safety switch
,SS IP67 industrial safety switch
,SIL2 magnetic interlock switch
1. Product Overview
The Schmersal BNS-B20-12Z-ST-L is a non-contact magnetic safety switch engineered for industrial access control in harsh environments. Featuring a stainless steel housing (IP69K rated), this device utilizes a coded magnetic actuator to monitor guard positions without physical contact. Certified to ISO 13849-1 PL d (Category 3) and IEC 62061 SIL 2, it delivers reliable performance in temperatures from -30°C to +85°C. The "12Z" designation indicates a 12mm switching distance with ±3mm lateral tolerance, accommodating installation misalignments. Integrated dual-color LEDs provide visual status for guard position (green) and diagnostics (yellow), while the corrosion-resistant AISI 316L construction withstands high-pressure washdowns (100 bar), chemicals, and UV exposure.
2. Key Technical Parameters
- Safety Ratings:
- PL d (ISO 13849-1 Cat. 3)
- SIL 2 (IEC 62061)
- Electrical:
- Voltage: 24V DC ±10%
- Contacts: 2 NC (6A @ 250V AC)
- Power Consumption: ≤2W
- Mechanical:
- Switching Distance: 12mm ±1mm
- Lateral Tolerance: ±3mm
- Environmental:
- IP69K (IEC 60529)
- Chemical Resistance: pH 1-14
- Materials:
- Housing: AISI 316L stainless steel
- Actuator: Ferrite-encapsulated magnet
- Certifications:
- UL 508, CSA 22.2 No. 14
- ATEX Zone 22
3. Primary Applications
This switch excels in demanding industrial environments:
- Food Processing: CIP washdown areas requiring EHEDG compliance
- Chemical Plants: Reactor access hatches with acid vapor exposure
- Pharmaceutical: Sterile filling line isolators
- Marine Engineering: Saltwater-resistant safety gates
- Automotive: Robotic welding cell access control
- Wastewater Treatment: Corrosion-resistant cover monitoring
- Packaging Machinery: High-humidity bottling lines
- Mining Equipment: Dust-immersion protection
Its IP69K rating and stainless steel construction ensure reliability in daily high-pressure sanitation cycles with caustic cleaners.
4. Functional Advantages
- Corrosion Resistance: Electropolished SS316L resists chloride-induced stress corrosion
- Tamper Prevention: Coded actuator pairing defeats standard magnets
- Diagnostic Intelligence:
- Green LED: Guard closed/secure
- Yellow LED: Actuator misalignment >1mm
- Installation Flexibility: ±3mm lateral tolerance simplifies alignment
- Maintenance Reduction: Non-contact operation (>10M cycles)
- Safety Compliance: Pre-validated for EN ISO 14119 Type 3
- Global Approvals: ATEX/IECEx Zone 22 certification
5. Safety Operation Principle
The switch operates via magnetic field interaction:
- Guard Closure:
- Actuator aligns within 12mm → reed contacts close
- Green LED illuminates
- Continuous Monitoring:
- Hall sensors detect position (±0.5mm)
- Current monitoring identifies contact welding
- Fault Response:
-
2mm displacement opens contacts within 20ms
- Yellow LED activates at >1mm misalignment
-
- Reset Protocol:
- Physical guard reclosure required
- System self-test verifies contact separation
| Parameter | Specification |
|---|---|
| Product Type | Compact Safety Interlock Switch with Solenoid-Release Guard Locking & LED Indication |
| Model Number | BNS-B20-12Z-ST-L |
| Safety Category (EN ISO 13849-1) | PLd, Category 3 |
| SIL Rating (EN IEC 62061) | SIL 2 |
| Actuation Principle | Integrated Lever Actuator (Self-Adjusting) |
| Contact Configuration | 1 N/O (Normally Open - Safety) + 1 N/C (Normally Closed - Monitoring) |
| Contact Material | Silver Alloy (AgSnO₂) |
| Rated Voltage (Ue) | 24V DC / 230V AC |
| Switching Current | 6 A (AC-15, 250V AC); 4 A (DC-13, 24V DC) |
| Utilization Category | AC-15 (230V AC), DC-13 (24V DC) |
| Locking Mechanism | Solenoid-Triggered Release (ST) + Mechanical Spring Locking |
| Locking Force | ≥ 400 N |
| Release Method | Electrical (24V DC solenoid) or Manual Override (via lever) |
| Housing Material | Fiberglass-Reinforced Polyamide (Grey) |
| Protection Rating | IP67 (NEMA 4/4X/13) |
| Electrical Connection | M12 × 1, 4-pin connector (Pre-wired 1.5m cable optional) |
| Conductor Cross-Section | 0.25–1.5 mm² |
| Operating Temperature | -25°C to +70°C |
| Mechanical Life | > 1,000,000 cycles |
| Electrical Life | > 100,000 cycles (AC-15, 230V, 3A) |
| Safety Standards | EN ISO 14119 (Type 4), EN 60947-5-1 |
| Approvals | CE, cULus, UKCA |
| Status Indication | Integrated LED (Green/Red) - Locking & Fault Monitoring |
| Manual Override | Lever-actuated emergency release (no tools required) |
| Actuator Tolerance | ±2 mm lateral adjustment |
Packaging & Shipping
Company Information
Xiamen ZhiCheng Automation Technology Co., Ltdit is a leading global supplier of control system components. We specialize in control systems and drives.
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