
Temperature and SSR Amperage Performance Curve
Watlow 25, 40 and 75 Ampere Solid State Relays
EZ-ZONE ST Solid State Relay with Heat Sink Specifications
RUI (EZKB) Utilized as a Communication Gateway Device
OIT
PLC
PC
The RUI (EZKB) can be used as a
communication gateway to connect
EZ-ZONE ST’s with Standard Bus to
other system components using
different communication protocols
such as EIA 232/485 Modbus
®
RTU,
EtherNet IP™/TCP Modbus
®
,
DeviceNet™ or PROFIBUS DP.
Up to 16
EZ-ZONE ST’s
EZ-ZONE ST
RUI (EZKB)
EIA 232/485 Modbus
®
RTU
EtherNet/IP™/TCP Modbus
®
DeviceNet™
PROFIBUS DP
Watlow Standard Bus
0
10
20
30
40
50
60
70
80
Degree °C (Heatsink Inlet Temperature)
Amperes (Full On)
25A
40A
75A
25A at 50°C
75A at 70°C
40A at 50°C
0
5
10
15
20 25
30
35
40
45
50
55
60
65
70
75
Current output (50°C) 25Arms 40Arms 75Arms
One-cycle surge current 600Apk 850Apk 1350Apk
Max. I
2
t for fusing 1500A
2
s 3000A
2
s 7560A
2
s
Thermo resistance 0.35°C/W 0.2°C/W 0.14°C/W
Base plate temperature (max.) 116°C 115°C 112°C
Forward voltage drop 1.3Vpk 1.3Vpk 1.3Vpk
Min. holding current 150mA 150mA 250mA
Frequency 47 to 63Hz 47 to 63Hz 47 to 63Hz
All Versions
Off-state leakage 1mA 1mA 1mA
Max. off-state dv/dt 500V/usec 500V/usec 500V/usec
120/240VAC
Output voltage range
24 to 280VAC 24 to 280VAC 24 to 280VAC
Over voltage rating 600Vpk 600Vpk 600Vpk
Input voltage range 0 to 28VDC 0 to 28VDC 0 to 28VDC
277/600VAC
Output voltage range
48 to 660VAC 48 to 660VAC 48 to 660VAC
Over voltage range 1200Vpk 1200Vpk 1200Vpk
Input voltage range 0 to 28VDC 0 to 28VDC 0 to 28VDC
Time Proportioned Models
Off-state leakage 6mA 6mA 6mA
Max. off-state dv/dt 200V/usec 200V/usec 200V/usec
120/240VAC
Output voltage range
100 to 240VAC 100 to 240VAC 100 to 240VAC
Over voltage rating 600Vpk 600Vpk 600Vpk
Input voltage range 2.7 to 10VDC 2.7 to 10VDC
2.7 to 10VDC
277/600VAC
Output voltage range
260 to 600VAC 260 to 600VAC
260 to 600VAC
Over voltage range 1200Vpk 1200Vpk 1200Vpk
Input voltage range 2.8 to 10VDC 2.8 to 10VDC 2.8 to 10VDC
Phase Angle Models
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