Output to 50A, 600Vac
DC Control Solid-State Relays
Series ST
Part Number
ST24D12
ST24D25
ST48D50
Description
12A, 4-30 Vdc
25A, 4-30 Vdc
50A, 5-30Vdc
For RoHS Compliant Contact Factory
NOTES
1) Line Voltage (nominal): 24 = 240 Vac; 48 = 480 Vac
2) Switch Type: D = Zero-cross turn-on;
FEATURES/BENEFITS
• Industry standard package
• Internal MOV (certain models)
• Control LED (certain models)
• AC or DC control available
• Excellent thermal performance
• Tight zero-cross window for low EMI
• 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.
UL File Number: E128555.
Figure 2 - ST relays
© 2018 TELEDYNE RELAYS
(800) 284-7007 • www.teledynerelays.com
ST Page 1
ST\042018\Q2
Output to 50A, 600Vac
DC Control Solid-State Relays
ELECTRICAL SPECIFICATIONS
(+25°C ambient temperature unless otherwise specified)
Series ST
INPUT (CONTROL) SPECIFICATIONS
Input Type
Control Range
ST24
ST48
ST24
ST48
ST
ST
S
D
D
D
D
D
D
D
4
5
3
5
30
30
30
46
1
1000
30
Vdc
Vdc
mA
mA
Vdc
Ohms
V
Min
Max
Units
OUTPUT (LOAD) SPECIFICATIONS (continued)
Input Type
I
2
t for Match Fusing (<8.3ms)
12A
output current
25A output current
50A output current
72
288
1500
A
2
S
A
2
S
A
2
S
Min
Max
Units
Input Current Range
ENVIRONMENTAL SPECIFICATIONS
Min
Storage Temperature
Operating Temperature
Input-Output Isolation
Output-Case Isolation
OUTPUT (LOAD) SPECIFICATIONS
Input Type
Operating Range
ST24
ST48
ST24
ST48
Min
12
24
.005
.005
.005
600
1200
12
25
50
120
240
550
1.3
1.2
1.45
±12
3
8.3
500
Arms
Arms
Arms
A
A
A
V
V
V
Vac
mA
ms
V/µS
Figure 4b - 25A output current
Must Turn-Off Voltage
Input Resistance (Typical)
Reverse Voltage Protection
Max
100
100
Units
°C
°C
Vrms
Vrms
Vrms
Vrms
-40
-40
4000
2500
2500
3300
12A output current
25A output current
50A output current
Max
280
600
Units
Vrms
Vrms
Vpeak
Vpeak
SURGE CURRENT
Peak Voltage
Load Current Range (Resistive)
12A output current
25A output current
50A output current
12A output current
25A output current
50A output current
12A output current
25A output current
50A output current
S
All relays
ST
All relays
D
D
Figure 4a - 12A output current
Maximum Surge Current Rating (Non-Repetitive)
On-State Voltage Drop
Zero-Cross Window (Typical)
Off-State Leakage Current (60Hz)
Turn-On Time (60Hz)
Off-State dv/dt
Figure 4c - 50A output current
NOTES:
1. Electrical specifications at 25°C unless otherwise specified.
2. For 800Hz applications, contact factory.
3. For additional/custom options, contact factory.
ST Page 2
SPECIFICATIONS ARE SUBJECT TO CHANGE WITHOUT NOTICE
© 2018 TELEDYNE RELAYS
ST\042018\Q2
Output to 50A, 600Vac
DC Control Solid-State Relays
Series ST
THERMAL CHARACTERISTICS
Figure 5a - 12A output current
Figure 5b - 25A output current
Figure 5c - 50A output current
© 2018 TELEDYNE RELAYS
(800) 284-7007 • www.teledynerelays.com
ST Page 3
ST\042018\Q2
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