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CHAPTER 1: OVERVIEW
Note
239 MOTOR PROTECTION RELAY – INSTRUCTION MANUAL
Courtesy of NationalSwitchgear.com
PHASE CT (1A)
PHASE CT (5A)
GROUND CT
(5A)
50:0.025 GROUND INPUT WITHSTAND:
Continuous:....................................................150 mA
Maximum: ......................................................12 A for 3 cycles
50:0.025 input can be driven by a 50:0.025 CT.
SWITCH INPUTS
Type: .....................................................................dry contacts
Output: ................................................................29 V DC, 10 mA (pulsed)
Duration:.............................................................100 ms minimum
CONTROL POWER
Input: ....................................................................90 to 300 VDC or
Power:..................................................................10 VA (nominal) 30 VA (max)
Holdup:................................................................non-failsafe trip: 200 ms
It is recommended that all 239 relays be powered up at least once per year to avoid
deterioration of electrolytic capacitors in the power supply.
FUSE TYPE/RATING
5 × 20mm, 2.5 A, 250V
Slow blow, High breaking capacity
INSTALLATION
HAZARD may result if the product is not used for its intended purpose.
Ventilation Requirements: .........................Natural air convection must be assured at all times
Cleaning Requirements: .............................None
BURDEN
1s xCT
5s xCT
continuous
xCT
100
40
3
100
40
3
100
40
3
70 to 265 VAC, 50/60 Hz
110 to 250 VDC (nominal)
100 to 240 VAC (nominal), 50/60 Hz
failsafe trip: 100 ms
both times at 120VAC / 125VDC
1–11
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