Struthers-Dunn
Struthers-Dunn
407 East Smith Street, Suite B
Timmonsville, SC 29161
Telephone: (843)346-4427
Fax: (843)346-4465
Email: info@struthers-dunn.com
Website: www.struthers-dunn.com
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The 21 and 136 series flash transfer relays have a proven industry record of reliability. Their rugged design has allowed the products to be plugged in and left, for years of service. Recent changes in lighting techniques from incandescent to LED have prompted us to respond with a redesigned relay better suited for the low currents of LED lighting, but equally usable with tungsten lamps.

Additional contact configurations and coil options are available

See Data sheet for additional info. Please use the RFQ/RFI tab above to submit your request.
Unit of Measure

Specifications

Series

 N/A 21

Contact Arrangement

 N/A XBX - (2 form C - DPDT)

Coil Voltage

 N/A 12 VDC

Contacts

Contact Configuration

 N/A DPDT

Contact Material

 N/A Silver Alloy

Contact Rating

 N/A 30 A

Contact Rating 120 / 240VAC Resistive

 N/A 30 A

Contact Rating 28VDC Resistive

 N/A 30 A

Motor 120VAC 1 Phase

 N/A 1 hp

Motor 240VAC 3 Phase

 N/A 2 hp

120VAC Tungsten

 N/A 20 A

Contact Resistance, Initial

 N/A 100 milliohms max at 6VDC

Coil

Coils Available

 N/A AC and DC

Nominal Coil Power

 N/A 2.4 VA

Input Voltage Tolerance - AC

 N/A 75% to 110% of nominal

Input Voltage Tolerance - DC

 N/A 70% to 110% of nominal

Drop-out voltge

 N/A 10% of nominal

Duty

 N/A Continuous

Timing

Operate Time (max)

 N/A 20 ms

Release Time (max)

 N/A 20 ms

Dielectric Strength

Across Open Contacts

 N/A 500 Vrms

Between Mutually Insulated Point

 N/A 1500 Vrms

Insulation Resistance

 N/A 10,000 Mohms min at 500VDC

Temperature

Operating

N/A -34 to 74 ºC-30 to 165 ºF

Storage

 N/A -40 TO 105 ºC-40 to 221 ºF

Life Expectancy

Electrical (full load)

 N/A 200,000

Mechanical (no load)

 N/A 5,000,000

Miscellaneous

Mounting Position

 N/A any

Enclosure

 N/A Clear Polycarbonate

Weight

 N/A 7.2 oz205 g