388 Series - Time Delay Relay 2PDT, 3PDT, 12 Amp 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 E43641 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. GENERAL SPECIFICATIONS ( 25 C) Timing: Functions Available On-delay, Off-delay, Interval Time Range Up to 180 minutes Timing Adjustment Knob or external R Timing Repeatability 0.1% (Constant voltage and temperature) Reset Time maximum 150mS Input Pulse Length minimum 50mS Contacts: Contact Configuration 2PDT, 3PDT Contact Material Silver Alloy Contact Rating 120 / 240VAC Resistive 12 Amp / 12 Amp 28VDC Resistive 12 Amp Motor 120VAC 1/3Hp Motor 240VAC 1/2Hp Minimum Contct Load Knob Adjustable 500mW Contact Resistance, Initial 100 milliohms max 6VDC, 1A Coil: Coils Available AC and DC Nominal Coil Power 2.75VA 2W Input Voltage Tolorance -AC 85% to 110% of nominal Input Voltage Tolorance -DC 80% to 110% of nominal Externally Adjustable Transient Protection Yes Reverse Polarity Protection Yes Duty Continuous 388TD Wire Diagram Dielectric Strength: On Delay Across Open Contacts 500Vrms Between Mutally Insulated Points 1500Vrms 1 2 3 Insulation Resistance 1,000 Mohms min 500VDC 4 5 6 Temperature: Operating -20 to 55C (-4 to 131F) Storage -40 to 85C (-40 to 185F) 7 8 9 Life Expectancy: Electrical (full load operations) 100,000 Mechanical (no load operations) 10,000,000 A B Input Miscellaneous: On Delay Mounting Position Any + - Mating Socket SK-SQB11-DS Enclosure Opaque Polycarbonate Weight Off Delay - External 4.0oz (113 grams) Adjustable 1 2 3 4 5 6 7 8 9 A B Input - + Off Delay www.struthers-dunn.com (843) 346-4427 7/17Timer / Sensor - Time Delay & Sensor Relays 5 - 25 Amp Outline Dimensions Dimensions Shown in inches & (millimeters) Flange Mount Externally Adjustable Knob Adjustable 0.65 (16.5) 1.87 2.15 (47.6) 1.87 (54.6) 2.15 (47.6) (54.6) .25 X .032 2.89 (6.3X .89) (73.4) QC Terminal .25 X .032 Typical 1 2 3 1 2 3 (6.3X .89) 4 5 6 4 5 6 QC Terminal 1.39 Typical 1 2 3 (35.3) 7 8 9 7 8 9 4 5 6 1.39 A A B B 7 8 9 (35.3) 0.19 A B (4.7) 1.51 (38.4) 1.51 (38.4) 1.39 (35.3) 1.51 (38.4) 388TD Part Number Chart Part number Nominal input voltage Timing range External resistor On delay plug-in 388ACPSOX-1 120VAC 0.1 to 10 seconds 20,000 ohms per second 388ACPSOX-2 120VAC 1.0 to 120 seconds 20,000 ohms per second 388CPSOX-1 24VDC 0.1 to 10 seconds 16,000 ohms per second 388CPSOX-2 24VDC 1.0 to 120 seconds 16,000 ohms per second On delay surface mount flange style 388ACQSOX-1 120VAC 0.1 to 10 seconds 20,000 ohms per second 388ACQSOX-2 120VAC 1.0 to 120 seconds 20,000 ohms per second 388CQSOX-2 24VDC 0.1 to 10 seconds 16,000 ohms per second Off delay plug-in 388CPSRX-22 24VDC 1.0 to 120 seconds 16,000 ohms per seconds www.struthers-dunn.com (843) 346-4427 7/18 Section 7