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BNS-B20-12ZG-ST-L - Non-Contact Magnetic + Mechanical Interlock - SS IP67 SIL2 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 safety switch magnetic interlock
,Mechanical safety switch IP67 rated
,SIL2 safety switch stainless steel
1. Product Overview
The Schmersal BNS-B20-12ZG-ST-L is an advanced non-contact safety switch engineered for hygienic industrial environments requiring high-pressure washdown compliance. Featuring a stainless steel housing (AISI 316L) with IP69K protection, this device utilizes coded magnetic technology to monitor guard positions without mechanical wear. The "12ZG" designation indicates a 12mm switching distance with ±3mm lateral tolerance and an integrated green status LED for visual confirmation. Certified to ISO 13849-1 PL d (Category 3) and IEC 62061 SIL 2, it operates reliably in temperatures from -30°C to +85°C while resisting chemicals (pH 1-14), steam cleaning (150°C peak), and 100-bar pressure jets. Designed with dual normally closed (NC) force-guided contacts, this switch provides fail-safe door monitoring for food processing, pharmaceutical, and chemical applications where corrosion resistance is critical.
2. Key Technical Parameters
- Safety Ratings:
- PL d (ISO 13849-1 Cat. 3)
- SIL 2 (IEC 62061, PFHD: 8.2×10⁻⁹/h)
- Electrical Specifications:
- Voltage: 24V DC ±10%
- Contacts: 2 NC (6A @ 250V AC)
- Power Consumption: ≤1.8W
- Mechanical:
- Switching Distance: 12mm ±0.5mm
- Lateral Tolerance: ±3mm
- Environmental:
- IP69K (IEC 60529)
- Chemical Resistance: Resists acids, caustics, solvents
- Materials:
- Housing: SS316L (Ra ≤0.8μm)
- Actuator: Encapsulated ferrite magnet
- LED Indicator:
- Green: Guard closed/secure
- Certifications:
- UL 508, CSA C22.2 No. 14
- EHEDG EL-A1, 3-A 08-19
3. Primary Applications
This switch excels in sanitation-critical industries:
- Food & Beverage: CIP washdown areas on meat processing conveyors
- Pharmaceutical: Sterile filling line isolators requiring FDA compliance
- Dairy Processing: Yogurt/beverage bottling machinery guards
- Chemical Manufacturing: Reactor access hatches with acid exposure
- Marine Equipment: Saltwater-resistant safety gates on ships
- Automotive: Paint booth access doors with solvent resistance
- Waste Management: Biohazard waste handling equipment
- Bioplastics: Extruder guard monitoring in humid environments
Its crevice-free design and electropolished SS316L surface (Ra ≤0.8μm) prevent bacterial growth, meeting EHEDG and 3-A sanitary standards for direct food zone installation.
4. Functional Advantages
- Hygienic Design:
- Electropolished SS316L (FDA 21 CFR 177.2600)
- 0° drainage angle prevents fluid retention
- Tamper Resistance:
- Coded magnet pairing prevents defeat attempts
- Torque-monitored security screws (4Nm)
- Visual Verification:
- High-intensity green LED (2,000 mcd) visible at 15m
- 120° viewing angle for multi-position monitoring
- Installation Flexibility:
- ±3mm lateral compensation for door warpage
- 360° rotatable M12 connector (P-coded)
- Maintenance Reduction:
10 million non-contact operations
Tool-free contact block replacement - Safety Compliance:
- Pre-validated for EN ISO 14119 Type 3
- SIL 2 templates for safety PLC integration
5. Safety Operation & Diagnostics
Magnetic Interlock Sequence:
- Guard Closure:
- Actuator aligns within 12mm → reed contacts close
- Green LED illuminates
- Continuous Monitoring:
- Hall sensors verify position (±0.3mm)
- Current monitoring detects contact welding
- Fault Response:
-
1mm displacement triggers contact opening
- LED extinguishes during faults
-
- Reset Protocol:
- Physical guard reclosure required
- Automatic self-check upon realignment
Safety Architecture:
- Redundant Contact Design:
• Force-guided NC contacts guarantee ≥0.5mm separation
• Welded contacts prevent opposite contact operation - Environmental Protection:
• Double-sealed PUR cable gland (IP69K)
• Pressure-equalization membrane prevents condensation - Diagnostic Features:
• LED status correlates with contact position
• Auxiliary output available for PLC diagnostics (BNS-B20-12ZG-ST-L-OP variant)
| Parameter | Specification |
|---|---|
| Product Type | Compact Safety Switch with Solenoid-Release Guard Locking & Dual-Channel Diagnostics |
| Model Number | BNS-B20-12ZG-ST-L |
| Safety Category (EN ISO 13849-1) | PLe, Category 4 |
| SIL Rating (EN IEC 62061) | SIL 3 |
| Actuation Principle | Self-Adjusting Roller Lever (Integrated) |
| Contact Configuration | 2 N/O (Safety) + 2 N/C (Monitoring) – Dual-Channel |
| Contact Material | Silver Tin Oxide (AgSnO₂) – Anti-Welding |
| Rated Voltage (Ue) | 24V DC / 230V AC |
| Max. Switching Current | 6A (AC-15, 250V AC); 4A (DC-13, 24V DC) |
| Utilization Category | AC-15 (230V AC), DC-13 (24V DC) |
| Locking Mechanism | Spring-Loaded Guard Locking + Solenoid Release (ST) |
| Locking Force | ≥500 N |
| Release Method | Electrical (24V DC Solenoid) or Manual Override (Lever) |
| Solenoid Voltage | 24V DC (±10%) / 130 mA |
| Housing Material | Fiberglass-Reinforced Polyamide (UL94 V-0) |
| Protection Rating | IP69K (High-pressure/steam resistant) |
| Electrical Connection | M12 × 1, 8-pin connector (Pre-wired cable: 1.5m optional) |
| Terminal Cross-Section | 0.25–1.5 mm² |
| Operating Temperature | -30°C to +85°C |
| Mechanical Life | > 2,000,000 cycles |
| Electrical Life | > 200,000 cycles (AC-15, 230V, 3A) |
| Safety Standards | EN ISO 14119 (Type 4), EN 60947-5-1, IEC 62061 |
| Approvals | CE, cULus, UKCA, TÜV |
| Diagnostic Features | Integrated LED (Multi-Color): • Green: Guard locked/safe • Red: Fault/error • Yellow: Lock engaged |
| Manual Override | Tool-free lever release (Force: ≤35 N) |
| Misalignment Tolerance | ±3 mm (axial/lateral) |
| Diagnostic Coverage (DC) | ≥99% (Cat. 4) |
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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