Solving your relay requirements since 1922
Amperite Co.
567 52nd Street
P.O. Box 329
West New York, NJ 07093
(800) 752-2329
www.Amperite.com
ST1A Series Solid
State
Delay-On-Make
Timers
… 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 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.
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).
)
Solving your relay requirements since 1922
Amperite Co.
567 52nd Street
P.O. Box 329
West New York, NJ 07093
(800) 752-2329
www.Amperite.com
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
1 to 100 minutes
.2 to 20 seconds
10 to 1000 minutes
1 to 100 seconds
.1 to 10 hours
10 to 1000 seconds
1 to 100 hours
.1 to 10 minutes
Timing tolerance: fixed units +/- 10%
Timing repeatability: 2%
Timing cycle interrupt transfer: none
Outline Dimensions:
AC (60 Hz) and DC Input Voltages & Limits
Nominal
Minimum
Maximum
12V 10V 14V
24V 20V 28V
48V 41V 55V
Solving your relay requirements since 1922
Amperite Co.
567 52nd Street
P.O. Box 329
West New York, NJ 07093
(800) 752-2329
www.Amperite.com
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
Solving your relay requirements since 1922
Amperite Co.
567 52nd Street
P.O. Box 329
West New York, NJ 07093
(800) 752-2329
www.Amperite.com
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
