Watlow SSR-240-10A-DC1, SSR-240-25A-DC1, SSR-240-50A-DC1, SSR-240-10A-AC1, SSR-240-25A-AC1 Specifications

Solid State Relay

Solid State Relay Offers

More For Less: Longer

Heater Life at Lower Cost

Watlow® solid state relays (SSR) offer many of the advantages of solid state power controllers, yet at a lower cost. Watlow’s extensive knowledge in power controller design has led to the development of a special fast cycle input card that enables a SSR to operate from a standard 4-20mA instrumentation command signal. Test results have shown that a zero cross SSR in combination with the fast cycle card promotes better temperature control and longer heater life than slow cycle relays. Through a time proportional cycle rate of one tenth of a second heater life will be extended.

Both low and high voltage models are available from

24 up to 530VAC. All ac output models include back to back Silicon Controlled Rectifiers (SCRs) for a more rugged design than the traditional triac based SSR. The internal design allows it to handle high currents and the harsh electrical environments of heavy industry. Watlow also offers a switched VDC model for dc heating applications.

Watlow can provide all the components necessary for trouble-free operation. This includes two standard

convenience items: a thermal foil to ensure proper thermal transfer from the relay to the heat sink and belville washers that ensure the relay is mounted with sufficient pressure for good heat transfer. Matched semiconductor fuses and heat sinks are available to complete the power switching package.

Features and Benefits

Fast cycle card

•Increases heater life

•Optimizes temperature control

•Allows for higher watt density heaters

Zero cross firing

•Results in minimal electrical noise

Back-to-back SCR design

•Withstands harsh or hostile industrial environments

UL® recognized File #E151484 and #E73741; CSA certified File #LR700195; VDE 60950 License #40021401, File #1995500 up to 480VAC

• Meets applications requiring agency approval

© 2013 Watlow Electric Manufacturing Company			WIN-SSR-0413

Specifications

Specifications Standard To All SSRs:

Dielectric Strength (Volts)	4000 RMS
Input, DC Control
Voltage range	3-32VDC
Typical input current	3.4 to 20mA
Turn on voltage (max.)	3VDC
Turn off voltage (min.)	1VDC
Input, AC Control
Voltage range	90-280VAC
Typical input current	2mA (typical) @ 120VAC
	4mA (typical) @ 240VAC
Turn on voltage (max.)	90VAC
Turn off voltage (min.)	10VAC
AC Output (Max.)
Forward voltage drop	1.5VAC and 2.1VDC
Min. holding current (mA)	50mA
Turn on-off time (ms)	up to 10ms (max.)
Frequency range	47 to 63Hz

Ambient Temperature Operating Curve

		85
		80
enclosureinsidetemperatureAmbient	(ºC)heatsinktheofrightorleftinches3		Heatsink000A-0815-Z100andXXX-10A-240-SSR		Heatsink000B-0815-Z100andDC1-20A-100-SSR	Heatsink000B-0815-Z100andXXX-25A-XXX-SSR		SSR				Heatsink000C-0815-Z100andXXX-50A-XXX-SSR
		75						-
								XXX
									-
									75A
		70							-
									XXX
										and
		65								Z100
											-
												0815			SSR-XXX-75A-XXX and
												-
		60											000C		Z100-0815-XXFC Heatsink
														Heatsink
		55
		50
		45
		40
		35
		30
		25
		5	10	15	20	25	30	35	40	45		50		55	60	65	70	75
							Load Current (Amperes)

120/240VAC

Model Number	SSR-240-10A-DC1	SSR-240-25A-DC1	SSR-240-50A-DC1	SSR-240-10A-AC1	SSR-240-25A-AC1	SSR-240-50A-AC1
Current output	10A	25A	50A	10A	25A	50A
Nominal voltage	120/240VAC	120/240VAC	120/240VAC	120/240VAC	120/240VAC	120/240VAC
One cycle surge current	120A	250A	625A	120A	250A	625A
Max. I2t for fusing	60A2 seconds	260A2 seconds	1,620A2 seconds	60A2 seconds	260A2 seconds	1,620A2 seconds
Thermal resistance	1.48° C/W	1.05° C/W	0.63° C/W	1.48° C/W	1.05° C/W	0.31° C/W
Ambient operating	-40 to 176°F	-40 to 176°F	-40 to 176°F	-40 to 176°F	-40 to 176°F	-40 to 176°F
temperature	(-40 to 80°C)	(-40 to 80°C)	(-40 to 80°C)	(-40 to 80°C)	(-40 to 80°C)	(-40 to 80°C)
Output (Max.)
Voltage range	48-280VAC	48-280VAC	48-280VAC	48-280VAC	48-280VAC	48-280VAC
Over voltage rating	600V (peak)	600V (peak)	600V (peak)	600V (peak)	600V (peak)	600V (peak)
Off state leakage	10mA	10mA	10mA	10mA	10mA	10mA

120/240VAC			Random Fired Models			100VDC
Model Number	SSR-240-75A-DC1	SSR-240-75A-AC1	SSR-480-50A-RND	SSR-480-75A-RND	SSR-240-10A-RND	SSR-100-20A-DC1
Current output	75A	75A	50A	75A	10A	20A
Nominal voltage	120/240VAC	120/240VAC	480VAC	480VAC	120/240VAC	100VDC
One cycle surge current	1000A	1000A	625A	1000A	120A	42A (10ms)
Max. I2t for fusing	6000A2 seconds	6000A2 seconds	1,620A2 seconds	6000A2 seconds	60A2 seconds	N/A
Thermal resistance	0.31° C/W	0.31° C/W	0.63° C/W	0.31° C/W	1.48° C/W	1.06° C/W
Ambient operating	-40 to 176°F	-40 to 176°F	-40 to 176°F	-40 to 176°F	-40 to 176°F	-4 to 176°F
temperature	(-40 to 80°C)	(-40 to 80°C)	(-40 to 80°C)	(-40 to 80°C)	(-40 to 80°C)	(-20 to 80°C)
Output (Max.)
Voltage range	48-280VAC	48-280VAC	80-530VAC	80-530VAC	48-280VAC	0-100VDC
Over voltage rating	600V (peak)	600V (peak)	1200V (peak)	1200V (peak)	600V (peak)	N/A
Off state leakage	10mA	10mA	10mA	10mA	10mA	0.3mA VDC
480 VAC
Model Number	SSR-480-25A-DC1	SSR-480-50A-DC1	SSR-480-75A-DC1	SSR-480-25A-ac1	SSR-480-50A-ac1	SSR-480-75A-ac1
Current output	25A	50A	75A	25A	50A	75A
Nominal voltage	480VAC	480VAC	480VAC	480VAC	480VAC	480VAC
One cycle surge current	250A	625A	1000A	250A	625A	1000A
Max. I2t for fusing	260A2 seconds	1,620A2 seconds	6,000A2 seconds	260A2 seconds	1,620A2 seconds	6,000A2 seconds
Thermal resistance	1.02° C/W	0.63° C/W	0.31° C/W	1.02° C/W	0.63° C/W	0.31° C/W
Ambient operating	-40 to 176°F	-40 to 176°F	-40 to 176°F	-40 to 176°F	-40 to 176°F	-40 to 176°F
temperature	(-40 to 80°C)	(-40 to 80°C)	(-40 to 80°C)	(-40 to 80°C)	(-40 to 80°C)	(-40 to 80°C)
Output (Max.)
Voltage range	48-530VAC	48-530VAC	48-530VAC	48-530VAC	48-530VAC	48-530VAC
Over voltage rating	1200V (peak)	1200V (peak)	1200V (peak)	1200V (peak)	1200V (peak)	1200V (peak)
Off state leakage	10mA	10mA	10mA	10mA	10mA	10mA