Powerohm Products

Ratings & Dimensions of Standard Size Units

RATINGS: The following table contains information on the most common size units, other variations are available.

DIMENSIONS: The dimensions listed in the table are in inches. Information subject to change without notice.

10 SECOND TIME RATINGS

CATALOG NUMBER

APPROX. WEIGHT

INITIAL AMPS

RESIS TANCE A

FRONTVIEW

B C

Neutral Bushing

2400 VOLTS LINE-TO-NEUTRAL (4160 VOLT SYSTEM) 1390 VOLTS LINE-TO-NEUTRAL (2400 VOLT SYSTEM) 30 30 30 30 30 30 30 30 38 38 38 38 38 38 38 38 38 38 38 38 38 38 38 38 100 200 300 400 500 600 800 1000 13.90 6.95 4.63 3.48 2.78 2.32 1.74 1.39

NR1390-100-10 NR1390-200-10 NR1390-300-10 NR1390-400-10 NR1390-500-10 NR1390-600-10 NR1390-800-10 NR1390-1000-10 NR2400-100-10 NR2400-200-10 NR2400-300-10 NR2400-400-10 NR2400-500-10 NR2400-600-10 NR2400-800-10 NR2400-1000-10 NR4160-100-10 NR4160-200-10 NR4160-300-10 NR4160-400-10 NR4160-500-10 NR4160-600-10 NR4160-800-10 NR4160-1000-10 NR8000-100-10 NR8000-200-10 NR8000-300-10 NR8000-400-10 NR8000-500-10 NR8000-600-10 NR8000-800-10 NR8000-1000-10

280 290 300 310 320 340 350 360 380 390 400 410 420 430 490 500 550 560 570 580 590 600 680 700 820 830 840 850 870 880 950 990

Ground Terminal

24.00 12.00

100 200 300 400 500 600 800 1000 100 200 300 400 500 600 800 1000

38 38 38 38 38 38 38 38 38 38 38 38 38 38 44 44 44 44 44 44 44 44 44 44

38 38 38 38 38 38 38 38 38 38 38 38 38 38 54 54 54 54 54 54 54 54 54 54

30 30 30 30 30 30 36 36 36 36 36 36 36 36 54 54 54 54 54 54 54 54 84 84

8.00 6.00 4.80 4.00 3.00 2.40

A

RIGHT SIDE VIEW

4160 VOLTS LINE-TO-NEUTRAL (7200 VOLT SYSTEM)

41.60 20.80 13.87 10.40 8.32 6.93 5.20 4.16

C

100 200 300 400 500 600 800 1000 8000 VOLTS LINE-TO-NEUTRAL (13800 VOLT SYSTEM) 1390 VOLTS LINE-TO-NEUTRAL (2400 VOLT SYSTEM) 30 30 36 38 38 38 80.00 40.00 26.70 20.00 16.00 13.30 10.00 8.00 EXTENDED TIME RATINGS 92.7 55.6 27.8 NR1390-15-E NR1390-25-E NR1390-50-E 15 25 50 38 38 38 2400 VOLTS LINE-TO-NEUTRAL (4160 VOLT SYSTEM)

B

The above drawing details a typical neutral grounding resistor with enclosure. Units are available with screened or louvered covers on front and back. All units normally have solid tops and sides and a perforated bottom. TO ORDER A NEUTRAL GROUNDING RE SISTOR NOT LISTED IN THE TABLE, SPECIFY THE FOLLOWING: 1. Line-to-neutral voltage. 2. Initial fault current. 3. Maximum time on. 4. Special requirements or options.

320 370 420

15 25 50

NR2400-15-E NR2400-25-E NR2400-50-E

160.0 96.0 48.0

38 38 44

38 38 54

36 36 54

450 550 850

4160 VOLTS LINE-TO-NEUTRAL (7200 VOLT SYSTEM)

15 25 50

NR4160-15-E NR4160-25-E NR4160-50-E

227.3 166.4 83.2

44 44 84

54 54 54

54 54 54

900 950 1400