645S Series - Solid State On / Off
10 - 75 Amp
3/15 www.struthers-dunn.com (843) 664-3303
Output Characteristics 10 Amp 25 Amp 40 Amp 50 Amp 75 Amp
Rated Load Current (rms)
Min. Load current to maintain on
Non-Repetitive Surge Current
(1 cycle)
Maximum I2T for Fusing
(Asquared sec)
Suggested Heatsink °C/W
Load Voltage Range
Frequency Range
Peak Blocking Voltage
Maximum Rate of Rise
Off State Voltage (dv/dt)
Max. Off state leakage current
(rms)
Max. On State Voltage Drop
Maximum Turn-On Time @ 60 Hz
Maximum Turn-Off Time @ 60 Hz
10A
100mA
80A
41A2 S
1.0°C/W
50 to 480VAC
47 to 63 Hz
800 to 1200
250V/uS
10mA
1.6VAC
8.3mS
8.3mS
25A
120mA
80A
510A2 S
0.14°C/W
50 to 480VAC
47 to 63 Hz
800 to 1200
300V/uS
10mA
1.6VAC
8.3mS
8.3mS
40A
250mA
800A
3745A2 S
0.14°C/W+FAN
50 to 480VAC
47 to 63 Hz
800 to 1200
475V/uS
10mA
1.6VAC
8.3mS
8.3mS
50A
250mA
520A
1035A2 S
0.14°C/W+FAN(2)
50 to 480VAC
47 to 63 Hz
800 to 1200
500V/uS
10mA
1.8VAC
8.3mS
8.3mS
75A
250mA
1150A
2600A2 S
0.14°C/W+FAN(2)
50 to 480VAC
47 to 63 Hz
800 to 1200
500V/uS
10mA
1.8VAC
8.3mS
8.3mS
Miscellaneous Characteristics
Dielectric Strength -
I or O to case
Operating Temperature Range
Storage Temperature Range
Weight
Input Terminal Size
Output Terminal Size
4000Vrms
-30 to 80°C
-40 to 100°C
320g
M3.5
M4
GENERAL SPECIFICATIONS (@ 25° C)
The 645S series of solid state relays uses back to back SCRs for on/control of three phase loads.
Operation is three pole normally open. Inputs can be AC or DC operated. Load currents can range
from 10 to 75 amps and up to a nominal voltage of 480VAC. Both random turn on or zero cross
construction is available.
E52197
Input Characteristics DC Input AC Input
Input Voltage
Must Release Voltage
Maximum Input Current
Reverse Polarity Protection
3 - 32VDC
1VDC
80mA
Yes
90 - 280 VAC
10VAC
30 mA
N/A
$ 64
Section 3
3/16
www.struthers-dunn.com (843) 664-3303
Motor Relays
15 - 75 Amp
Solid State On/Off Wire Diagram
+
-
L1
L2
L3
440VAC
F1 F2 F3
R S T
U V W
Motor
3
Outline Dimensions
Dimensions Shown in inches & (millimeters)
2.93
(74.6)
2.18
(55.4) 1.88
(47.7)
.75
(19.1)
3.72
(94.6)
4.14
(105.1)
.83
(21.6)
.21
(5.3)
1.29
(32.8)
.93
(23.5)
Derating Curve
1.17
(29.7)
.02
(.5)
Ø .50
(12.7)
Ø .21
(5.3)
Ordering Code 645 S Z or R 4 10 3-32VDC
Series
645
Switching
SCR - CODE S
Turn on
Zero cross - CODE Z
Random turn on CODE R
Load Voltage
480VAC - CODE 4
Maximum Load Current
10, 25, 40, 50, 75 (Amp)
Input Voltage
3-32VDC
90-280VAC
Maximum ambient temperature (°C)
45
40
35
30
25
20
15
10
010 20 30 40 50 60 70 80
Load current (Amps)
50
55
60
65
70
75
80
