Relay Circuit Diagram and Contact Configuration

The document provides top-view circuit diagrams for two relay models: SIR312SEN and SIR222SEN. The SIR312SEN features 3 normally open (NO) contacts and 1 normally closed (NC) contact, while the SIR222SEN has 2 NO and 2 NC contacts. Coil terminals are labeled A1 and A2.

Insulation Specifications

• Basic insulation at 250 VAC with air and creepage distance >4 mm; test voltage 2500 V / 50 Hz / 1 min.
• Double or reinforced insulation options at 250 VAC with increased air and creepage distances (>8 mm and >10 mm) and higher test voltages (4000 V and 5000 V respectively).
• Contact open test voltage: 1500 V / 50 Hz / 1 min.
• Creepage resistance CTI 250, pollution degree 2, overvoltage category III.
• Insulation resistance at 500 VDC >100 MΩ.

Mechanical and Electrical Performance

• Mechanical endurance exceeds 10 million operations.
• Mechanical switching frequency up to 15 Hz.
• Typical response time: 18 ms; drop-out time: 5 ms (without spark suppression).
• Bounce times: NO contact ~6 ms, NC contact ~12 ms.
• Shock resistance: NO contact >10g, NC contact >6g; vibration resistance: NO >5g (10-200 Hz), NC >1.5g.
• Short circuit contact resistance withstands 1000 A with 10 A gG/gL pre-fuse.
• Operating ambient temperature range: -40°C to +70°C.
• Thermal resistance: 55 K/W; coil temperature limit: 120°C.
• Weight approximately 30 grams; mounting position is flexible with recommended spacing >5 mm.

Standards, Approvals, and Testing

• UL File E188953 Section 3 approval.
• Insulation class per IEC 60664-1 at 250 VAC.
• Fire protection rating UL 94 V0.
• Compliance with IEC 61810-1 and IEC 61810-3 standards.
• Test method A / group assembly; type of protection RT II.
• Solder bath temperature: 270°C for 5 seconds.

Contact Data and Electrical Ratings

• Contact material: Silver tin oxide (AgSnO2) with 0.2 μm gold plating.
• Contact type: Crown contact.
• Rated switching capacity: 250 VAC, 10 A AC1, 2500 VA.
• Electrical life at AC1 (360 operations/hour): approximately 100,000 cycles.
• Maximum inrush current: 25 A for 20 ms.
• Switching voltage range: 5 to 250 V DC/VAC.
• Switching current range: 10 mA to 10 A.
• Contact resistance as delivered: ≤100 mΩ at 6 V / 100 mA.

Coil Characteristics

Standard coils are designed for direct current with nominal voltages ranging from 5 VDC to 60 VDC. Key parameters include minimum pick-up voltage, drop-out voltage, nominal current, and coil resistance at 20°C. For example, a 24 V coil has a minimum pick-up voltage of 18 V, drop-out voltage of ≥2.4 V, nominal current of 15 mA, and resistance of 1600 Ω ±10%.

Switching Capacity and Load Limits

• Maximum switching characteristics per DIN EN60947-5-1: AC15 at 230 V / 5 A; DC13 at 24 V / 7.5 A at 0.1 Hz.
• UL 508 ratings: C600 / R300.
• Maximum contact load at AC1 with 230 V: up to 2 contacts with 10 A each or 3 contacts with 8.4 A each.
• Load limit curves provided for inductive loads (L/R 40 ms) and resistive loads, indicating operational current and voltage limits.

Additional Features and Options

• PCB relay with forcibly guided contacts ensuring protective separation between coil/control and output contacts (>10 mm), and between output contacts (>8 mm).
• IEC 61810-3 Type A classification.
• Small external dimensions suitable for compact installations.
• Nominal coil power consumption: 0.36 W; holding coil power: 0.12 W.
• Coils suitable for railway applications per EN 50155 available on request.
• Optional print sockets available as accessories.

Physical Dimensions

Dimensions are provided in millimeters, indicating compact size with detailed measurements for mounting and terminal spacing.

Manufacturer Information

Produced by ELESTA GmbH, Switzerland. Contact details include phone number +41 81 303 54 00.