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 388 timers are square base, bladed versions of time delay relays. On delay, off delay and interval functions are all available with either AC or DC inputs. On delay and interval products can have up to three poles. Off delays have two poles. The timing circuit is oscillator based. Fixed time and externally adjustable versions. Both socket and flange mount versions are available.

Additional contact configurations and coil options are available – please use the RFQ/RFI tab above to submit your request.
UL Recognized & CSA
Unit of Measure

Specifications

Series

 N/A 388

Type

 N/A On delay plug-in

Nominal Input Voltage

 N/A 120 VAC

Timing

Functions Available

 N/A On-delay

Timing Range

 N/A 1.2 to 120 s

External Resistor

 N/A N/A Ω/s

Timing Adjustment

 N/A Knob

Timing Repeatability (Constant voltage and temperature)

 N/A 0.1%

Reset Time maximum

 N/A 150mS

Input Pulse Length minimum

 N/A 50mS

Contacts

Contact Configuration

 N/A 2PDT

Contact Material

 N/A Silver Alloy

Contact Rating

 N/A 12 A

Contact Rating 120 / 240VAC Resistive

 N/A 12 A / 12 A

Contact Rating 28VDC Resistive

 N/A 12 A

Contact Rating Motor 120VAC

 N/A 1/3 hp

Contact Rating Motor 240VAC

 N/A 1/2 hp

Minimum Contact Load

 N/A 500 mW

Contact Resistance, Initial

 N/A 100 milliohms max at 6VDC, 1A

Coil

Coils Available

 N/A AC and DC

Transient Protection

 N/A Yes

Reverse Polarity Protection

 N/A Yes

Nominal Coil Power AC

 N/A 2.75 VA

Nominal Coil Power DC

 N/A 2 W

Input Voltage Tolerance - AC

 N/A 85% to 110% of nominal

Input Voltage Tolerance - DC

 N/A 80% to 110% of nominal

Duty

 N/A Continuous

Dielectric Strength

Across Open Contacts

 N/A 1000 Vrms

Between Mutually Insulated Point

 N/A 1500 Vrms

Insulation Resistance

 N/A 1,000 megohms min at 500VDC

Temperature

Operating

N/A -20 to 55 ºC-4 to 131 ºF

Storage

 N/A -40 to 85 ºC-40 to 185 ºF

Life Expectancy

Electrical (full load)

 N/A 100,000

Mechanical (no load)

 N/A 5,000,000

Miscellaneous

Mounting Position

 N/A any

Mating Socket

 N/A SK-SQB11-DS

Enclosure

 N/A Opaque Polycarbonate

Weight

 N/A 4.0 oz113 g