Bircher ZK-3520-220, a time delay relay used in industrial automation and control systems:

Technical Specifications

• Model: ZK-3520-220
• Type: Time Delay Relay
• Operating Voltage: 220 V AC
• Power Consumption: 8 VA
• Timing Range: TR-2 to 20 seconds
• Mounting: DIN rail or panel mount
• Weight: Approx. 0.70 lbs (0.3 kg)
• Manufacturer: Bircher Smart Access
• Status: Discontinued by manufacturer (still available via surplus distributors)
• Warranty: Typically covered by a 2-year Radwell warranty when purchased through them