21/136 Series - Transfer Relays
DPDT, 30 Amps
E13224
21 Series only
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.
GENERAL SPECIFICATIONS (@ 25° C)
Contacts:
Contact Configuration
Contact Material
Contact Rating
120 / 240VAC Resistive
28VDC Resistive
Motor 120VAC 1 Phase
Motor 240VAC 3 Phase
120VAC Tungsten
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
21 Series
DPDT
Silver Alloy
30 Amp
20 Amp
1 1/2Hp
2Hp
20 Amp
100 milliohms max @ 6VDC
AC and DC
2.4VA
75% to 110% of nominal
70% to 110% of nominal
10% of nominal
Continuous
20 mS
20 mS
136 Series
DPDT
Silver Alloy
30 Amp
20 Amp
1/4Hp
-
20 Amp
100 milliohms max @ 6VDC
AC and DC
6VA
85% to 110% of nominal
75% to 110% of nominal
10% of nominal
Continuous
20 mS
20 mS
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
provide less power con-
sumption and less
heating.
500Vrms
500Vrms
1500Vrms
1500Vrms
10,000 Mohms min @ 500VDC 10,000 Mohms min @ 500VDC
-34 to 74°C (-30 to 165°F)
-40 to 105°C (-40 to 221°F)
200,000
5,000,000
Any
Clear Polycarbonate
7.2oz (205 grams)
-34 to 74°C (-30 to 165°F)
-40 to 105°C (-40 to 221°F)
100,000
5,000,000
Any
Clear Polycarbonate
8.1oz (230 grams)
Wire Diagram
7
5
3
1
8
6
4
2
1/3
www.struthers-dunn.com
(843) 664-3303
General Purpose Relays
Dimensions Shown in inches & (millimeters)
Outline Dimensions
NEW
New Flash Transfer Relay
21XBXPL
with
Coil Voltage Indicating LED
3.84
(97.6)
2.77
(70.4)
.60
(15.2)
.46
(11.8)
Speed trouble shooting at busy intersections:
Decreased service time
Increased technician safety
Instantly know which relays are in “ON” position
Super brite LED light pipe - Visible in sun light
.43
(11.0)
1.00
(25.4) .50
(12.7)
2.12
(53.9)
0.06
(1.5)
1.75
(44.5)
0.25
(6.3)
2.37
(60.3)
Polarizing Pin
Newly Available
Ordering Code
Series
21
Contact Arrangement
XBX - (2 form C - DPDT)
Optional Features
Polycarbonate cover - CODE P
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
21
XBX
P
120VAC
21 Legacy
Part Number Chart
UL Approved
Part numbers
21ACPX-2
21ACPX-8
May also order
Part numbers/Midtex Type
136-62T3A1
Voltage
120VAC
Alternate Part Number &
Voltage
21XBXP-120VAC
21XBXP-240VAC
www.struthers-dunn.com
(843) 664-3303
1/4
Section 1
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