HAC1 Crydom Co., HAC1 Datasheet - Page 4

• 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

there is no arcing or transients generated upon the contact’s closure. Once closed, the voltage
drop across the contacts is lower than the Solid State switches minimum operating voltage, and
therefore they effectively become shorted out and no longer conduct load current. 100% of the
load current then flows exclusively through the EMR contacts eliminating any significant power
dissipation in the Solid State switches as explained further below.
Solid State switching normally produces power dissipation in the form of thermal heating when
load current is being conducted. The power dissipated is calculated by multiplying the output
forward voltage drop, typically 1.1 to 1.4 volts, by the load current in amps. For a 3 phase circuit
the power dissipation in each phase is added. This power dissipation must be managed to
produce reliable performance of a pure Solid State switch or Relay. The 3RHP completely
eliminates this power dissipation and subsequently any heat sink(s) that would have otherwise
been required to keep the Solid State switch within its allowed operating temperature range: a
major advantage of the 3RHP Contactor design.
When the 3RHP is de-energized, the switching sequence is reversed from the turn on process.
That is, the EMR coil is de- energized while the internal Solid State switch control signal
remains active. Once the coil’s magnet field diminishes enough to permit the contact’s spring
return force to overcome the magnetic field, the contacts begin to open. At the instant this
occurs, the voltage across the Solid State switches begins to rise and each phase’s Solid State
switch (SCR) turns back on immediately. The result is that any arc that would begin to rise is
extinguished at a very low value as the Solid State switches turn back on.
The Solid State switches remain on for approximately 1 AC cycle (16 to 20 mSec depending
upon line frequency), permitting the EMR contacts to fully open and return to their normally
open position. The Solid State switches then stop conducting load current at the next zero
current crossing point for each phase, eliminating opening transients typical of EMR contacts.
This switching process completely eliminates the electrical noise and mechanical damage to
contacts that typically occurs upon contact opening, thus extending the electrical life of the
contacts by a factor of at least 10.
An additional feature of the 3RHP is that it includes an internal over temperature protection
circuit which will shut down the control of the 3RHP in the event the Solid State Switches
exceed their allowed temperatures or if the allowed ambient temperature is exceeded, thus
protecting the 3RHP from damage.
automatically reset once the over temperature condition is normalized.
Two accessories, shown in Figure 4, are available for use with the Crydom 3RHP 3 Phase
Solid State Contactor, including a DIN rail mounting bracket that can be installed on the 3RHP
mounting base (DMB3), and an external auxiliary contact switch (HAC1). The auxiliary switch
includes one normally open and one normally closed contact, each rated at 5 amps rms, 600
VAC, 50/ 60 Hz. The external auxiliary contacts permit pilot duty switching and or status
indication of open or closed position of the Contactor.
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
Note:
if the protection circuit is activated, it will
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