POTTER & BRUMFIELD 
PRD series

10 to 50 AMP HEAVY DUTY
AC OR DC POWER RELAY

File E22575 (Models With All Screw Terminals)
File E22575 (All Others)
File 15734

· Contact ratings to 50 amps.
· Magnetic blowouts available for switching DC loads
· Arrangements to DPDT.
· SPDT auxiliary switch available.
· Replaces PR series.

Arrangements:  Available to 2 Form C (DPDT). 
               See ordering information table.
Ratings:       See UL contact rating table.
Material:      Silver and silver-cadmium oxide standard. 
               Other materials available for special applications.
Expected Life: 100,000 operations at rated loads @25"C. 
               Contact life increases at reduced loads or with 
               appropriate arc suppression.

Type                   Supply          Contact Ratings
                     AC  or  DC
PRD 1, 2, 3                            25 amps at 277VAC
    4, 5, 6          AY      DY         1 HP   at 120VAC
                                        2 HP   at 250VAC
                                       10 amps at 600VAC
                                        7 amps at 50VDC Res.

PRD 1, 2, 3                            30 amps at 277VAC Res.
    4, 5, 6          AG      DG         1.5 HP at 120VAC
                                        2 HP   at 250VAC
                                       10 amps at 6OOVAC


PRD 7, 8 or 11                         25 amps at 240VAC
                     AY      DY        20 amps at 277VAC
                                        1 HP   at 120VAC
                                        2 HP   at 250VAC
                                        7 amps at 50VDC Res.
                                       10 amps at 6OOVAC


PRD 7, 8 or 11                         30 amps at 240VAC
                     AG      DG        20 amps at 277VAC
                                        1.5 HP at 120VAC
                                        2 HP   at 250VAC
                                       10 amps at 600VAC


PRD 3,7, 8 or 11     AH      DH        20 amp at 125VDC
                     AJ      DJ        1/3 HP at 125VDC

Type         Contact Ratings                         Minimum Life
              50 Amps. 277VAC max., General Purpose  100,000 Cycles
PRD3AP4       30 Amps. 277VAC max., Ballast            6,000 Cycles
PRD3DP4       15 Amps. 277VAC max., Tungsten           6,000 Cycles
             102 LRA,  17 FLA, 240VAC                 30,000 Cycles
             120 LRA,  20 FLA, 120VAC                 30,000 Cycles
             1.5 HP at 120VAC                         30,000 Cycles
               3 HP at 240VAC                         30,000 Cycles

Type             Contact Ratings

PRD3AR4          60 Amps, 28VDC Res.
PRD3DR4          30 Amps, 125VDC Res.

Arrangements: 1 Form C (SPDT). 
Rating:       5 amps at I20VAC, 60 Hz. @ 25 Degree C. 
Material:     Silver.

Initial Breakdown Voltage: 2,000V rms minimum between all elements
                           and ground. (2,200V rms on 600V ratings.)

Voltage:    From 6 to 220VDC, and 6 to 480VAC. 
Resistance: See coil data table.
Nom. Power: DC coils: - 2.0 watts @ 25 degree C.
            AC coils: - 9.8 VA    @ 25 degree C.
Max Power:  DC coils: - 8.0 watts @ 25 degree C.
Duty Cycle: Continuous.
Initial Insulation Resistance: 100 megohms, minimum.

      "DY" AND "DG"                     "AY" AND "AG"
        DC COILS                         AC COILS (50-60HZ.) Nominal Res.

Nominal   Resistance    Nominal DC      Nom.    DC Resis.     Nominal AC
Volts     In Ohms       Current In      Volts   In Ohms       CurrentIn 
          +/-10%@25C    Milliamps               +/-15%@25"C   Milliamps

  6          18         333               6             .86   1600 
 12          71         169              12            3.2     820
 24         288          84              24           72.0     410
110        6050          18.2           120          290        85
220     use 110V relay with             240         1200        43
        approx. 6 ,000 ohm              480         4500        22
        5W wire-wound

Must-Operate Voltage: DC: 75% of nominal voltage @ 25C
                      AC: 85% of nominal voltage @ 25C

Temperature Range: AC: -55 Degree C to +45 Degree C
                   DC: -55 Degree C to +80 Degree C

Mounting:  Two .187" (4.75mm) diameter holes on 1.875" (47.63 mm) centers.
Termination: See ordering information tables for various options. 
Insulating Material: Molded phenolic.
Enclosure: Metal dust cover, 35D013, available. Order separately. 
Weight:    10 oz. (284g) approximately.