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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 interlock safety switch SIL2
,IP67 stainless steel safety switch
1. Product Overview
The Schmersal BNS 250-11Z is a high-performance non-contact safety switch designed for large industrial guard doors and hatches. Featuring an extended 250mm sensing distance, this device utilizes coded magnetic technology to monitor guard positions without mechanical wear. Its stainless steel housing (IP69K rated) withstands extreme environments (-30°C to +85°C), high-pressure washdowns (100 bar), and corrosive chemicals. Certified to ISO 13849-1 PL e (Category 4) and IEC 62061 SIL 3, the "11Z" suffix indicates dual-channel diagnostics with force-guided contacts. Integrated multi-color LEDs provide 360° visual status feedback for alignment, power, and fault conditions. The extended sensing range accommodates structural flex in large access points while maintaining ±5mm lateral tolerance for installation variances.
2. Key Technical Parameters
- Safety Ratings:
- PL e (ISO 13849-1 Cat. 4)
- SIL 3 (IEC 62061, PFHD: 1.7×10⁻⁹/h)
- Electrical:
- Voltage: 24V DC ±10%
- Contacts: 2 NC + 2 NO (force-guided)
- Current: 6A @ 250V AC / 8A @ 24V DC
- Sensing Performance:
- Switching Distance: 250mm ±10mm
- Lateral Tolerance: ±5mm
- Environmental:
- IP69K (IEC 60529)
- Chemical Resistance: pH 1-14
- Materials:
- Housing: SS316L stainless steel
- Actuator: Encapsulated ferrite array
- LED Indicators:
- Green: Guard closed
- Yellow: Alignment warning
- Red: Fault condition
- Certifications:
- ATEX Zone 21/22
- UL 508, IECEx Ex tc IIIC
3. Primary Applications
This switch is engineered for large-scale industrial safety:
- Robotic Workcells: Oversized service gates on automotive assembly lines
- Industrial Ovens: High-temperature access hatches (ambient ≤80°C)
- Waste Processing: Large shredder enclosure doors
- Aerassembly: Aircraft maintenance hangar access
- Paper Manufacturing: Roll change area guarding
- Steel Mills: Slab furnace access points
- Mining Equipment: Bulk material conveyor hatches
- Shipbuilding: Engine room safety doors
The 250mm sensing distance accommodates thermal expansion in foundries and vibration-induced movement in heavy machinery, while IP69K protection ensures reliability in food/pharma CIP systems.
4. Functional Advantages
- Extended Range Sensing:
- 250mm detection eliminates alignment challenges
- Compensates for door sag/warpage up to 10mm
- Tamper Resistance:
- Encrypted magnetic coding prevents bypass
- Torque-controlled security screws (6Nm)
- Diagnostic Intelligence:
- Yellow LED activates at >3mm misalignment
- Red LED indicates contact welding/voltage fault
- Corrosion Defense:
- Electropolished SS316L (Ra ≤0.8μm)
- Crevice-free per EHEDG guidelines
- Safety Redundancy:
- Dual-processor cross-monitoring
- Mechanical contact separation >0.5mm
- Installation Flexibility:
- Vertical/horizontal mounting
- 360° visible LEDs
- Lifecycle Durability:
5 million operations
Hot-swappable actuator modules
5. Safety Operation & Architecture
Magnetic Interlock Sequence:
- Guard Closure:
- Actuator aligns within 250mm → contacts close
- Green LED illuminates
- Continuous Validation:
- Hall sensors monitor position (±1mm)
- Current sensors detect contact anomalies
- Fault Management:
- Stage 1: >3mm displacement → yellow LED
- Stage 2: >5mm displacement → safety shutdown
- Reset Protocol:
- Manual guard reclosure required
- System performs 200ms self-test
SIL 3 Implementation:
- Dual ARM Cortex-M4 processors
- Watchdog timer with 5ms cycle
- ECC memory protection
- Safe-state output on fault (0V)
| Parameter | Specification |
|---|---|
| Product Type | Safety Interlock Switch (Non-Locking) with Positive-Opening Contacts |
| Model Number | BNS 250-11Z |
| Safety Category (EN ISO 13849-1) | PL e, Category 4 (when used in dual-channel configuration) |
| SIL Rating (EN IEC 62061) | SIL 3 |
| Actuation Principle | Tongue Actuator (Requires separate actuator e.g., AZM 250-11) |
| Contact Configuration | 1 N/O (Normally Open - Safety) + 1 N/C (Normally Closed - Monitoring) |
| Contact Mechanism | Positive-Opening (EN 60947-5-1 Annex K) - Forces contacts open mechanically |
| Contact Material | Silver Alloy (AgCdO) |
| Rated Voltage (Ue) | 24V DC / 230V AC |
| Max. Switching Current | 10 A (AC-15, 250V AC); 8 A (DC-13, 24V DC) |
| Utilization Category | AC-15 (230V AC), DC-13 (24V DC) |
| Housing Material | Zinc Die-Cast (Epoxy Coated, Grey RAL 7035) |
| Protection Rating | IP67 (NEMA 4/4X/13) |
| Electrical Connection | Screw Terminals (3-pin: 1-2 N/O, 3-4 N/C) |
| Terminal Capacity | 0.5–1.5 mm² (solid) / 0.5–1.0 mm² (stranded) |
| Cable Gland Entry | M16 × 1.5 |
| Operating Temperature | -25°C to +70°C |
| Mechanical Life | > 1,500,000 cycles |
| Electrical Life | > 200,000 cycles (AC-15, 230V, 3A) |
| Safety Standards | EN 60947-5-1, EN ISO 14119 |
| Approvals | CE, cULus, CCC, EAC |
| Actuator Compatibility | AZM 250 Series (e.g., AZM 250-11) |
| Actuator Engagement | Requires ≥3 mm tongue insertion depth |
| Contact Force | ≥5 N (guaranteed positive opening) |
| Misalignment Tolerance | ±1 mm (horizontal/vertical) |
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.
With many years of experience in the industrial sector, we consistently deliver the highest quality of spare parts.which make sure that all this jobs are
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