SIF4 Series

SIF4 Series

Product catalog summary
Overview: The document provides technical specifications for the SIF4 Series relays by ELESTA GmbH, designed with forcibly guided contacts compliant with IEC 61810-3 standards. These relays are suitable for print mounting and offer protective separation.
Features: The relays are compact with a height of 10.9 mm and allow SMD placement underneath. They come in two contact assembly configurations: SIF222 (2 NO + 2 NC) and SIF312 (3 NO + 1 NC).
Dimensions: Detailed measurements are provided for proper installation, including pin dimensions and recommended PCB drilling sizes.
Coil Data: At 20°C, the nominal power is 0.70 W with a holding power of 0.21 W. The coil limit temperature is 120°C, and various nominal voltages are specified with corresponding current and resistance values.
Insulation Data: The rated insulation voltage is 250 VAC with a test voltage of 4,000 Vrms for 1 minute. The relays offer double or reinforced insulation with a minimum air and creepage distance of 5.5 mm.
Mechanical Data: The relays have a mechanical lifetime of at least 10 million operations and a maximum switching frequency of 15 Hz. They are resistant to shock and vibration, with specific values for NO and NC contacts.
Environmental and Safety Standards: The relays operate within an ambient temperature range of -40°C to +70°C and have a thermal resistance of 60 K/W. They are approved by cULus and TÜV and meet the flammability class UL 94 V-0.
Contact Data: The contact material is AgCuNi with a gold layer. The rated switching power is 2,000 VA, and the relays can handle inrush currents up to 30 A for 20 ms. The electrical life expectancy is 100,000 operations at specified conditions.
Options and Accessories: Other coil designs are available, including those compliant with EN 50155 for railway applications.
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Catalog excerpts

SIF4 Series-1

Contact data - Relay with forcibly guided contacts according to IEC 61810-3 - Application type A - Protective separation (see insulation data) - Suitable for print mounting - SMD placement under the relay possible - Height only 10,9 mm - Contact assembly SIF222: 2 NO + 2 NC, SIF312: 3 NO + 1 NC Contact material AgCuNi + 0,2, ..., 0,4 μm Au Type of contact Single contact with notched crown Rated switching power 2 000 VA 250 V / 8 A / AC-1 (max.) Electr. life time (0,1 Hz, rel. duty cycle 10%) 100 000 Inrush current 30 A for 20 ms Switching voltage range 5, ..., 250 V DC / AC Switching current range* 3 mA, ..., 8 A Switching power range* 40 mW, ..., 2 000 W (VA) Contact resistance as new (max.) 100 mΩ Short circuit resistance of NO contacts** 1 000 A with pre-fuse SCPD 10 A gG / gL (fuse) Short circuit resistance of NC contacts** 1 000 A with pre-fuse SCPD 6 A gG / gL (fuse) Insulation data Electrical life (NO contacts) Rated insulation voltage (IEC 60664-1) 250 VAC Double or reinforced insulation - Air and creepage distance (min.) 5,5 mm - Test voltage 4 000 Vrms / 1 min Open contact: Test voltage* 1 500 Vrms / 1 min Creepage resistance CTI 175 Pollution degree 2 Overvoltage category III Insulation resistance (min.) 100 MΩ - Test voltage 500 VDC * Reference values ** Prospective short-circuit current Circuit diagram (top view) * do not drill under the relay if SMD is mounted ** open vent stack Pin dimension b Pin dimension c Pin dimension d Recommended drilling on PCB * Initial value Nominal power (typ.) Holding power (typ.) Coil limit temperature Switching capacity (IEC 61810-1) AC-1: 240 V / 8 A MAX AC-15: 240 V / 5 A MAX DC-1: 24 V / 8 A MAX DC-13: 24 V / 5 A / 0,1 Hz MAX Switching capacity (UL 508) Continuous current per contact at load of: 1 or 2 contacts 3 contacts Contact load limit curve (DC) Mechanical lifetime (min.) 10 x 106 operations Switching frequency (max.) 15 Hz Response time (NO closed) (typ.) 12 ms Drop-out time (NC closed) (typ.)* 5 ms Bounce time (typ.) NO: 1,5 ms / NC: 15 ms Shock resistance (16 ms) (min.) NO: 15g / NC: 5g Vibration resistance (10-200 Hz) (min.) NO: 10g / NC: 2g Weight approx. 20 g Mounting position any Mounting distance (min.) 5 mm * without coil wiring  Other data Ambient temperature Thermal resistance Protection class Solder bath temperature Test method (heating) Approvals Flammability class UL File -40 °C, ..., +70 °C 60 K / W RT II 270 °C / 5 s A (group assembly) cULus, TÜV UL 94 V-0 E188 953 Sec.6 Excitation voltage range Options, Accessories Other coil designs possible Coils accord. to EN 50155 (railway applications) possible Test conditions: - Graph 1: Contact current 5 A MAX - Graph 2: without previous operation - Free-standing relay on PCB - Duty cycle 100% ELESTA GmbH, Heuteilstrasse 18, CH - 7310 Bad Ragaz, Switzerland Type designation Number of contacts NO Number of contacts NC Connection technology N

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