ST1A Series Solid
State
Delay-On-Make
Timers
Timing Mode:
Delay on operate begins upon application of input power. The load is energized at the end of
the delay period and remains so until input power is removed.
… 100% solid state circuitry - no moving
parts
… CMOS digital timing circuitry
… Fixed or field adjustable delays from
milliseconds to hours
… 2 amperes continuous load current (10
amperes available, consult factory)
Timing Diagram:
Contact Information:
Solid state switching device 1 form A; normally open series connection. Continuous current
rating 2 amperes. Maximum inrush 20 amperes. Voltage drop 2.5 volts RMS or less @ 2
amperes. (For 10 ampere load current rating consult factory).
Note: Maximum current rating for 110V DC os 2 ampers (heat sink required).
)
Timing Specifications:
Timing: Factory fixed, or 0.1 seconds to 100 hours in any of the ranges below. Timing is set by
user supplied resistor or potentiometer. Custom timing available.
Timing ranges:
.1 to 10 seconds
.2 to 20 seconds
1 to 100 seconds
10 to 1000 seconds
.1 to 10 minutes
Timing tolerance: fixed units +/- 10%
Timing repeatability: 2%
Timing cycle interrupt transfer: none
Outline Dimensions:
1 to 100 minutes
10 to 1000 minutes
.1 to 10 hours
1 to 100 hours
AC (60 Hz) and DC Input Voltages & Limits
Nominal Minimum Maximum
12V 10V 14V
24V 20V 28V
48V 41V 55V
110V 95V 125V
120V 105V 130V
230V 190V 255V
External Resistor Selection:
Wiring Diagrams:
Mechanical Information:
Enclosure 2 X 2 X 3/4 inch black plastic, epoxy sealed. Center hole mounting. Three or five 1/4
inch quick connect male terminals
Ordering Information:
Definition of a part number for the Amperite ST1A Series Time Delay Relay:
Example:
A: Denotes nominal input voltage. Voltages available: 12V, 24V, 120V & 230V AC; 12V,
24V, 48V & 110V DC. Custom voltages are available.
B: Denotes type of input power required for operation: A = AC - Alternating Current; D = DC Direct Current.
C & D: Denotes range of adjustability by using an external resistor or potentiometer, where C
is the minimum timing and D is the maximum timing. Standard timing span is 100:1. For fixed
timing units specify a single number.
E: Denotes unit of time delay: S=seconds; M=minutes; H=hours.
F: Denotes Amperite ST1A Series solid state, delay-on-make timer.
Solving Your Relay Requirements Since 1922
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