HAC1 Crydom Co., HAC1 Datasheet - Page 3

• Manufacturer Part Number: HAC1
• Description: SWITCH EXTERNAL AUXILIARY CNTCT
• Manufacturer: Crydom Co.

Specifications of HAC1

• Relay Terminals: Quick Connect
• Contact Current Ac Max: 5A
• Contact Voltage Ac Max: 600V
• No. Of Poles: 1
• Contact Configuration: SPDT-1NO / 1NC
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With: 3RHP Series Solid State Contactor
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

CRYDOM HYBRID SOLID STATE CONTACTOR
DESIGN AND OPERATION
The Crydom three-phase Hybrid Solid State Contactor or 3RHP combines three Solid State
switches and one 3 phase EMR Definite Purpose Contactor with proprietary control circuitry. As
shown in Figure 3, a Solid State switch in parallel with an EMR contact forms each pole of the
3RHP. When a control signal is applied to the 3RHP input terminals, all 3 of the Solid State
Switches are turned on immediately and simultaneously to connect the load to the 3 phase AC
power supply.
Power SCRs comprising the three Solid State switches conduct the initial load current and any
associated surge currents through their respective phases. The Solid State switching virtually
eliminates any arcing and resulting transients that would otherwise be generated by a closing
mechanical contact(s). SCRs are ideal for this Solid State switching function due to their typical
x10 surge current ratings and contact-less switching.
Furthermore, 3RHP output switching is instantaneous turn-on rather than zero-crossing. The
Solid State outputs switch immediately while the EMR output is dependent upon the inherent
delays of the electromagnetic coil and travel time of the contacts. As a result, the actual
mechanical contact closure occurs several milliseconds after the solid state output is switched.
This eliminates potential phase delays and ensures that the SSR output is fully conducting load
current before the EMR contacts close.
At the time the 3 EMR contacts close, the voltage across them is equal to the forward voltage
drop across the Solid State Switches (SCRs) which is approximately 1.1 to 1.4 volts. Thus,
Figure 3 - 3RHP Hybrid Solid State Contactor block diagram (one phase shown).
control
AC or
DC
Control
circuit
Input Status
Crydom Inc.
2320 Paseo de las Americas, Suite 201
San Diego, CA, 92154
Tel: [phone]
Fax: [phone]
E-Mail: [e-mail]
Web: www.crydom.com
trigger
trigger
circuit
circuit
SSR
EMR
EMR Output
SSR Output
LOAD
Supply
Power
AC
3