Overview

The document details the specifications, features, and application guidelines for the KOBRA Stainless Steel Safety Interlock Switch, specifically the HYGIECAM MK1-SS model. These switches are designed for position interlock detection on small moving machine guards, suitable for environments requiring high hygiene standards such as food processing and packaging.

Product Description

• Model: HYGIECAM MK1-SS
• Material: Stainless Steel 316 with mirror polished finish (RA10) for hygienic environments
• Design: Compact (30mm wide, 98mm long, 22mm fixing centers), rotatable head with up to 8 actuator entry positions
• Actuator Options: Stainless steel rigid, plastic flexible actuator for tight radius guards
• Contact Blocks: Replaceable, with options for gold-plated contacts for low power circuits

Functional Specifications

• Positive break contacts compliant with EN60947-5-1
• High functional safety compliant with ISO13849-1, capable of up to PLe Category 4
• 3-pole switch configuration
• Compatible with most safety relays
• Ingress protection rating IP69K (high resistance to water and dust)

Electrical and Mechanical Data

• Rated insulation voltage: 600 Vac
• Withstand voltage: 2500 Vac
• Thermal current: 5A
• Utilization category: AC15 A300 3A
• Mechanical reliability: B10d of 2.5 million operations at 100mA load
• Proof test interval (life expectancy): 35 years
• Mean time to dangerous failure (MTTFd): 356 years
• Probability of dangerous failure per hour (PFHd): 3.44 x 10^-8
• Travel for positive opening: 6mm
• Maximum actuator approach/withdrawal speed: 600 mm/s
• Vibration resistance: IEC 68-2-6, 10-55 Hz + 1 Hz, 0.35mm excursion

Dimensions and Installation

• Body dimensions: 98mm length, 30mm width, 22mm fixing centers
• Fixing: 2 x M4 screws
• Mounting position: Any
• Conduit entries: Various options including M20 and 1/2" NPT
• Rotatable head allows 8 actuator entry positions for flexible installation

Standards and Certifications

• ISO14119 - Safety of machinery - Interlocking devices associated with guards
• EN60947-5-1 - Control circuit devices and switching elements
• EN60204-1 - Safety of machinery - Electrical equipment of machines
• ISO13849-1 - Safety-related parts of control systems
• EN62061 - Safety of machinery - Functional safety of safety-related electrical control systems
• UL508 - Standard for Industrial Control Equipment

Application Example

The document illustrates a guard door interlock system with dual channel wiring. The interlock switch circuits (11-12 and 21-22) directly feed contactor coils K1 and K2, providing dual channel safety and feedback monitoring through auxiliary contacts. Opening the interlock or pressing the emergency stop isolates power, preventing machine restart unless the guard is closed and emergency stop reset.

Accessories and Options

• Stainless Steel 316 gland options for conduit entry (M20 and 1/2" NPT)
• Stainless Steel Guide accessory for guard alignment (sales number 140179-SS)
• Flexible plastic actuator for tight radius guards
• Gold plated contacts available for low power circuits (5V, 5mA)

Critical Information and Best Practices

• Ensure actuator entry radius minimum: 150mm standard, 100mm with flexible actuator
• Use recommended stainless steel gland for enhanced durability and protection
• Replace contact blocks as needed to maintain switch reliability
• Follow wiring and safety relay compatibility guidelines to achieve up to PLe Cat.4 safety level
• Regularly verify mechanical and electrical integrity to maintain proof test interval and safety performance