21CPX-3 STRUTHERS-DUNN, 21CPX-3 Datasheet
21CPX-3
Manufacturer Part Number
21CPX-3
Description
POWER RELAY, DPDT, 24VDC, 30A, PLUG IN
Manufacturer
STRUTHERS-DUNN
Datasheet
1.136-62T3A1.pdf
(2 pages)
Specifications of 21CPX-3
Relay Type
Alternating Load
Coil Voltage Vdc Nom
24V
Contact Current Max
30A
Contact Voltage Ac Nom
240V
Contact Voltage Dc Nom
28V
Contact Configuration
DPDT
Coil Type
DC
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
5/3
GENERAL SPECIFICATIONS (@ 25° C)
Contacts:
Contact Configuration
Contact Material
Contact Rating
Contact Resistance, Initial
Coil:
Coils Available
Nominal Coil Power
Input Voltage Tolerance - AC
Input Voltage Tolerance - DC
Drop-out voltge
Duty
Timing:
Operate Time (max)
Release Time (max)
Dielectric Strength:
Across Open Contacts
Between mutally insulated point
Insulation resistance
Temperature:
Operating
Storage
Life Expectancy:
Electrical (full load)
Mechanical (no load)
Miscellaneous:
Mounting Position
Enclosure
Weight
E13224
21 Series only
120 / 240VAC Resistive
28VDC Resistive
Motor 120VAC 1 Phase
Motor 240VAC 3 Phase
120VAC Tungsten
The 21 and 136 series flash transfer relays have a proven industry record of reliability. Their
rugged design has allowed the products to be plugged in and left, for years of service.
Recent changes in lighting techniques from incandescent to LED have prompted us to respond
with a redesigned relay better suited for the low currents of LED lighting, but equally usable with
tungsten lamps.
10,000 Mohms min @ 500VDC
www.struthers-dunn.com
100 milliohms max @ 6VDC
-40 to 105°C (-40 to 221°F)
-34 to 74°C (-30 to 165°F)
21 / 136 Series - Flash Transfer Relay
70% to 110% of nominal
70% to 110% of nominal
DPDT, 30 Amp
Clear Polycarbonate
7.2oz (205 grams)
10% of nominal
AC and DC
Continuous
Silver Alloy
1500Vrms
21 Series
5,000,000
500Vrms
200,000
30 Amp
30 Amp
20 Amp
20 mS
20 mS
DPDT
2.4VA
1Hp
2Hp
Any
10,000 Mohms min @ 500VDC
100 milliohms max @ 6VDC
-40 to 105°C (-40 to 221°F)
-34 to 74°C (-30 to 165°F)
85% to 110% of nominal
75% to 110% of nominal
Clear Polycarbonate
8.1oz (230 grams)
10% of nominal
136 Series
AC and DC
Continuous
Silver Alloy
1500Vrms
5,000,000
500Vrms
100,000
30 Amp
20 Amp
20 Amp
(843) 664-3303
20 mS
20 mS
DPDT
1/4Hp
6VA
Any
-
The 21 series coil is
rectified which provides
chatter free operation in
brownout conditions down
to 85VAC and will not
overheat up to 130VAC.
Rectified coils also pro-
vide less power consump-
tion and less
heating.
Wire Diagram
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21CPX-3 Summary of contents
Page 1
... Operating -40 to 105°C (-40 to 221°F) Storage Life Expectancy: Electrical (full load) Mechanical (no load) Miscellaneous: Mounting Position Clear Polycarbonate Enclosure Weight www.struthers-dunn.com 5/3 136 Series 21 Series DPDT DPDT Silver Alloy Silver Alloy 30 Amp 30 Amp 20 Amp 30 Amp ...
Page 2
... Light Pipe for coil voltage indicator - CODE L *Gold diffused, serrated contacts - CODE 33 Coil Voltage AC: 120, 240 (Add VAC) DC: 12, 24 (Add VDC) Coil voltages and frequencies must be specified *Ideal for LED lamp applications www.struthers-dunn.com Outline Dimensions Dimensions Shown in inches & (millimeters) 3.84 (97.6) .60 (15.2) 1 ...