© 2001 TELEDYNE RELAYS (800) 284-7007 • www.teledynerelays.com ST 1
ST\072001\Q1
Single Output to 75A 600 Vac
AC/DC Control
FEATURES/BENEFITS
•Industry standard package
• Internal MOV (certain models)
•Control LED (certain models)
• AC or DC control available
•Excellent thermal performance
• Low zero cross level
• High immunity to surges
DESCRIPTION
The Series ST single-phase relays are designed for
high-power applications. The design incorporates an
SCR or triac output. The Series ST relays utilize optical
isolation to protect the control from load transients.
Control LED is available on certain models. All Series
ST relays are zero crossing. Internal MOV is also
available on ST24D 25A and 50A models.
APPLICATIONS
•Heating control
•Industrial and process control
•On/Off controls of AC equipment
APPROVALS
All models are UL recognized.
Series ST
NOTES
1) Line Voltage (nominal): 24 = 240 Vac; 48 = 480 Vac
2) Switch Type: D = Zero cross turn-on; A = AC control,
Zero cross turn-on
3) Options: -02 = Control LED: Standard on all ST48D
Only available on ST24D 12A and 40A (standard)
-16 = Internal MOV:
Only available on ST24D 25A and 50A
-22 = 24 Vac Control
MECHANICAL SPECIFICATION
TOLERANCE: ±01 (0.3)
WEIGHT: 3.18 oz. (90g)
1~ 2~
4- 3+
1.1 (28)
Ø.19 (Ø4.7)
1.7 (43.2)
1.87 (47.6)
.26 (7.5)
.2 (5.1)
1 (25.4)
1.75 (44.5)
M4
M3
2.29 (58.2)
1.06 (27)
.77 (19.6)
.9 (22.8)
1.02 (25.8)
(±.02)
Figure 1 — ST relays, dimensions in inches (mm)
Figure 2a — ST relays
TYPICAL APPLICATION
Part Numbers
Package & Line Switch Output Options3
Chip Type Voltage1Type2Current
ST 24 D 12 -02
48 25 -16
40
50
75
ST 24 A 25
50
ST 48 A 25 -22
Part Number Example: S48A25-22
Figure 2b — ST -02 option relays Figure 2c — ST -16 option relays
4
-
3
+
Control
Line
Voltage
Load
-
+
1
2
• 1–2 can be changed
• SSR must be mounted on a heat sink
Line Protection
4-
3+
-
+
1
2
• 1–2 can be changed
• SSR must be mounted on a heat sink
Line Protection
LED
Control
Line
Voltage
Load
4
-
3
+
Load
-
+
1
2
• 1–2 can be changed
• SSR must be mounted on a heat sink
Line Protection
Control
Line
Voltage
ST 2 SPECIFICATIONS ARE SUBJECT TO CHANGE WITHOUT NOTICE © 2001 TELEDYNE RELAYS
ST\072001\Q1
Series ST
INPUT (CONTROL) SPECIFICATION
Input Type Min Max Units
Control Range
ST24 D 4 30 Vdc
A90240 Vac/Vdc
ST48 D 5 30 Vdc
A1780Vac/Vdc
Input Current Range
ST24D 3 30 mA
ST24DXX-02 4 48 mA
ST24A 3 8 mA
ST48D 5 46 mA
ST48A25-22 5.6 26 mA
Must Turn-Off Voltage
ST D 1 Vdc
ST24 A 15 Vac
ST48 A 3 Vac
Input Resistance (Typical)
ST D 1000 Ohms
ST D-02 600 Ohms
ST A 3000 Ohms
Reverse Voltage Protection
SR/D 30 V
SA NA
CONTROL CHARACTERISTICS
Figure 3a — ST24D relays
Figure 3b — ST -02 relays
Figure 3c — ST24A relays
Figure 3d — ST24A25-22
Control Voltage (V)
Input Current (mA)
4
6
8
10
14
16
20
18
22
24
26
28
30
12
2
0
210 12 140468 1618 26 28 3020 22 24
02 46 8101214161820 22242628300
0
5
10
15
20
25
30
35
40
45
50
0
Input Current (mA)
Control Voltage (V)
Control Voltage (V)
Input Current (mA)
4
6
8
2
0
20 100 120 1400406080 160180 200 220 240
Control Voltage (V)
Input Current (mA)
0
01020304050607080
5
10
15
20
25
30
OUTPUT (LOAD) SPECIFICATION
Input Type Min Max Units
Operating Range
ST24 12 280 Vrms
ST48 24 600 Vrms
Peak Voltage
ST24 600 Vpeak
ST48 1200 Vpeak
Zero Cross Window (Typical)
SD/A ±12 Vac
© 2001 TELEDYNE RELAYS (800) 284-7007 • www.teledynerelays.com ST 3
ST\072001\Q1
OUTPUT (LOAD) SPECIFICATION (continued)
Input Type Min Max Units
Load Current Range (Resistive)
12A output current .005 12 Arms
25A output current .005 25 Arms
40A output current .005 40 Arms
50A output current .005 50 Arms
75A output current .005 75 Arms
Operating Frequency Range
All relays 0.1 440 Hz
Non-Repetitive Overload Current
12A output current 120 A
25A output current 240 A
40A output current 350 A
50A output current 550 A
75A output current 1000 A
On-State Voltage Drop
12A output current 1.3 V
25A output current 1.2 V
40A output current 1.4 V
50A output current 1.45 V
ST48D50-02 1.4 V
75A output current 1.4 V
Off-State Leakage Current at rated voltage, 60Hz
All relays 3 mA
Tu r n-On Time (60 Hz)
ST D 8.3 ms
ST A 24.9 ms
Tu r n-Off Time (60 Hz)
ST D 8.3 ms
ST A 24.9 ms
Off-State dv/dt
All relays 500 V/µs
Maximum di/dt (Non-Repetitive)
All relays 50 A/µs
Series ST
1010.10.01
50
100
150
0
t(s)
Apeak
Non-repetitive
Repetitive with initial T
j
= 70°C
11010.10.01
0
50
100
150
200
250
0
t(s)
A
peak
Non-repetitive
Repetitive with initial T
j
= 70°C
1100.10.01
0
100
200
300
400
0
t(s)
A
peak
Non-repetitive
Repetitive with initial T
j
= 70°C
1100.10
0
200
400
600
0
t(s)
Apeak
Non-repetitive
Repetitive with initial T
j
= 70°C
t(s)
A
peak
1010.10.01
500
1000
1500
0
Non-repetitive
Repetitive with initial Tj = 70°C
SURGE CURRENT
Figure 4a — 12A output current
Figure 4b — 25A output current
Figure 4c — ST24D40-02
Figure 4d — 50A output current and ST48D40-02
Figure 4e — 75A output current
NOTES:
1. Electrical specifications at 25°C unless otherwise specified.
ST 4 SPECIFICATIONS ARE SUBJECT TO CHANGE WITHOUT NOTICE © 2001 TELEDYNE RELAYS
ST\072001\Q1
T case
max (°C)
100
95
90
85
80
75
1.1
°
C/W
1.6
°
C/W
6
°
C/W
4
°
C/W
Full on state
50% duty cycle
0
2
4
6
8
10
12
14
16
18
20
01 2 34 5 67 891011 12 0 10 20 30 40 50 60 70 80 90 100 110 120
RMS Load Current (A) Ambient Temperature (°C)
2.2
°
C/W
Power Dissipation (W)
RMS Load Current (A) Ambient Temperature (°C)
T case
max (°C)
100
90
80
70
0.95
°
C/W
0.75
°
C/W
1.6
°
C/W
1.1
°
C/W
2.2
°
C/W
Full on state
50% duty cycle
0
0
5
10
15
20
25
30
35
40
24681012 14 16 18 20 22 24 26 0 10 20 30 40 50 60 70 80 90 100 110 120
6
°
C/W
Power Dissipation (W)
2.2
°
C/W
1.1
°
C/W
0.95
°
C/W
0.75
°
C/W 0.55
°
C/W
1.6
°
C/W
6
°
C/W
Full on state
50% duty cycle
0
0
5
10
15
20
25
30
35
40
45
50
55
60
24681012 14 16 18 20 22 24 26 3028 32 34 36 38 40 0 10 20 30 40 50 60 70 80 90 100 110 120
65
90
100
80
70
75
85
95
T case
max (°C)
RMS Load Current (A) Ambient Temperature (°C)
Power Dissipation (W)
RMS Load Current (A) Ambient Temperature (°C)
051015 20 25 30 35 40 45 50 55 60
0
0
10
20
30
40
50
60
70
80
90
100
0
0.3
°
C/W0.55
°
C/W
1.6
°
C/W
6
°
C/W
0.95
°
C/W
Full on state
50% duty cycle
010 203040 5060 7080 90100 110 120
70
80
90
100
75
85
95
T case
max (°C)
0.75
°
C/W
1.1
°
C/W
2.2
°
C/W
Power Dissipation (W)
RMS Load Current (A) Ambient Temperature (°C)
70
80
90
100
75
85
95
T case
max (°C)
1002030405060708090
0
10
20
30
40
50
60
70
80
90
100
110
120
130
0102030405060708090100 110 120
2.2
°
C/W
1.1
°
C/W
0.3
°
C/W
1.6
°
C/W
6
°
C/W
0.55
°
C/W
0.75
°
C/W
0.95
°
C/W
Full on state
50% duty cycle
Power Dissipation (W)
RMS Load Current (A) Ambient Temperature (°C)
Power Dissipation (W)
2. 2
°
C/W
1.1
°
C/W
0.95
°
C/W
0.3
°
C/W
0.75
°
C/W
1.6
°
C/W
0
10
20
30
40
50
60
70
80
90
100
110
120
130
140
01020304050607080901001101200102030405060708090100 110
Full on state
50% duty cycle
70
80
90
100
75
85
95
T case
max (°C)
6
°
C/W
Series ST
Figure 5a — 12A output current
Figure 5c — 25A output current
Figure 5d — ST24D40-02
Figure 5e— 50A output current and ST48D40-02
Figure 5f — 75A output current
Figure 5b — ST48D12-02
OUTPUT (LOAD) SPECIFICATION (continued)
Input Type Min Max Units
I2t for Match Fusing (<8.3ms)
12A output current 72 A2S
ST24 25A output current 288 A2S
ST48 25A output current 265 A2S
40A output current 612 A2S
50A output current 1500 A2S
75A output current 5000 A2S
ENVIRONMENTAL SPECIFICATION
Min Max Units
Storage Temperature –40 100 °C
Operating Temperature –40 100 °C
Input-Output Isolation 4000 Vrms
Output-Case Isolation
12A output current 2500 Vrms
25A output current 2500 Vrms
ST24D40-02 2500 Vrms
ST48D40-02 3300 Vrms
50A output current 3300 Vrms
75A output current 3300 Vrms
THERMAL CHARACTERISTICS
