CKR = CKR Series
Input (Control) Type
D = 4.0-32 Vdc
A = 90-280 Vrms
= 18-36 Vrms (suffix E)
24 = 24 - 280
48 = 48 - 530
60 = 48 - 660
10 = 10 Amp
20 = 20 Amp
30 = 30 Amp
CKR A 2 4 3 0 E P 1 0
Blank = Zero Cross
10 = Random
Integrated Overvoltage Protection
Blank = Not Included
P = Included
AC Control Range
Blank = 90-280 Vrms
E = 18-36 Vrms
Note: For detailed electrical specifications see Crydom individual data sheets.
All parameters at 25°C unless otherwise specified.
Off-State dv/dt test method per EIA/NARM standard RS-443, paragraph 13.11.1
Turn-on time for DC control random turn-on versions is 0.02msec.
Input circuitry for DC control version incorporates active current limiter.
Over Current and Short Circuit
A solid state relay should be protected by a semiconductor fuse.
This type of fuse provides extremely fast opening of the circuit.
A fuse should be selected that has an I 2t let-through rating that
is less than the I 2t capability of the SSR, for the same duration.
Transient Over Voltage (P OPTION)
Select "P" option for internal overvoltage protection. At the
presence of high voltage transient the output of the SSR will be
triggered on, and the transient will be passed on to the load circuit
This is a non-degrading method of protection that ensures that
other SSR benefits are maintained.
Earth Bonding (Grounding)
The CKR heatsink is equiped with an earth bonding screw as is
required for Class 1 Protection, in accordance with EN 60950
• Maximum wire size of AWG#10 (3mm) on
both input and output terminals.
Connections • Ensure that wires ends are stripped to a
minimum length of 0.4 inch (10mm).
Recommended Screw Torque Range
• 5.0-6.0 in lb (0.6-0.7 Nm) on input and output termination.
All dimensions are in inches (millimeters)
0.17 (4.3) DIA.
Current Rating 20A @ 25°C
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