Print Back
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               Made in U.S.A.
388 Series - Time Delay Relays
388 Series - Time Delay Relays - Dimensional Picture
Unit of Measure
Items 388 Series - Time Delay Relays
388ACPSOX-1
388 Series - Time Delay Relays
388 Series - Time Delay Relays
388ACPSOX-2
388 Series - Time Delay Relays
388 Series - Time Delay Relays
388ACQSOX-1
388 Series - Time Delay Relays
388 Series - Time Delay Relays
388ACQSOX-2
388 Series - Time Delay Relays
388 Series - Time Delay Relays
388CPSOX-1
388 Series - Time Delay Relays
Series N/A 388
Type N/A On delay plug-in N/A On delay plug-in N/A On delay surface mount flange style N/A On delay surface mount flange style N/A On delay plug-in
Nominal Input Voltage N/A 120 VAC N/A 120 VAC N/A 120 VAC N/A 120 VAC N/A 24 VDC
Functions Available N/A On-delay, Off-delay, Interval
Timing Range N/A 0.1 to 10 s N/A 1.0 to 120 s N/A 0.1 to 10 s N/A 1.0 to 120 s N/A 0.1 to 10 s
External Resistor N/A 20,000 Ω/s N/A 20,000 Ω/s N/A 20,000 Ω/s N/A 20,000 Ω/s N/A 16,000 Ω/s
Timing Adjustment N/A Knob or external R
Timing Repeatability (Constant voltage and temperature) N/A 0.1%
Reset Time maximum N/A 150
Input Pulse Length minimum N/A 50
Contact Configuration N/A 2PDT, 3PDT
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
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
Across Open Contacts N/A 500 Vrms
Between Mutually Insulated Point N/A 1500 Vrms
Insulation Resistance N/A 1,000 Mohms min at 500VDC
Operating N/A -20 to 55 ºC-4 to 131 ºF
Storage N/A -40 to 85 ºC-40 to 185 ºF
Electrical (full load) N/A 100,000
Mechanical (no load) N/A 10,000,000
Mounting Position N/A any
Mating Socket N/A SK-SQB11-DS
Enclosure N/A Opaque Polycarbonate
Weight N/A 4.0 oz113 g