neutral grounding resistor monitoring description the ngrm-enc enclosed neutral-grounding-resistor (ngr) monitor series is a type 4x enclosure housing a littelfuse startco se-325 or se-330 neutral-grounding-resistor monitor and optional accessories that include a 480/600-v control power transformer (cpt), faulted-phase indication (fpi; implemented with an el3100 ground-fault & phase-voltage indicator), earth-leakage panel meter, pulse-enable control, and mounting options. appropriate fusing is included and feld wiring is to terminal blocks. ngrm-enc series ngrm-enc rev: 4-d-032515 based on manual rev: 0-b-030515 ngr l2 ct l1 se-330 series er series (sensing resistor) (ngr monitor) el3100 ngrm-enc (se-330 with voltage indication shown) dn da db dc ngr assembly (ordered separately) simplifed circuit diagram ordering information the following options are available with a faster shipping time: ordering number protection relay option ngr monitor mounting option ammeter & pulse control option comms control-power transformer option ngrm-enc-000-01 se-325 surface mounted none none cpt ngrm-enc-200-01 se-330 (k4=no) surface mounted none none cpt ngrm-enc-201-01 se-330 (k4=no) panel mounted none none cpt ngrm-enc-201-11 se-330 (k4=no) panel mounted ammeter none cpt ngrm-enc-230-01 se-330 (k4=no) surface mounted none ethernet/2 rj45 ports cpt NGRM-ENC-231-01 se-330 (k4=no) panel mounted none ethernet/2 rj45 ports cpt options se-325 neutral-grounding-resistor monitor measures current and voltage in a transformer or generator neutral-to-ground connection and continuity of the neutral-grounding resistor. se-330 neutral-grounding-resistor monitor advanced ground-fault and neutral-grounding resistor monitoring relay that measures neutral current, neutral-to-ground voltage, and neutral-to- ground resistance. el3100 ground-fault & phase-voltage indicator three panel-mounted leds indicate the ground- faulted phase. panel meter panel-mounted meter displays earth leakage current as a percentage of the ground-fault- ct-primary rating. rk-332/rk-302 remote indication and reset panel-mounted remote indication and reset assemblies are included with se-325 and surface-mounted se-330 confgurations. protection relays & controls ? 2015 littelfuse protection relays & controls
rev: 4-d-032515 based on manual rev: 0-b-030515 protection relays & controls specifcations enclosure polyester, lockable. se-330 panel-mount options are rated to ip65. all other options are rated to type 4x. dimensions h 454 mm (17.9) w 406 mm (16) d 264 mm (10.4) clearance required to open se-ip65cvr-g 112 mm (4.4) approvals c csa us warranty 1 year ordering information protection relay option network communications option ngr monitor mounting option ammeter & pulse control option control-power transformer option ngrm-enc- x x x C x x 0=se-325 1=se-325 & voltage indication (1) 2=se-330 (n.o. k4) 3=se-330 (n.o. k4) & voltage indication (1) 4=se-330 (n.c. k4) 5=se-330 (n.c. k4) & voltage indication (1) 6=se-330hv (n.o. k4) 7=se-330hv (n.o. k4) & voltage indication (1) 8=se-330hv (n.c. k4) 9=se-330hv (n.c. k4) & voltage indication (1) 0=no network communications 1=devicenet (2) 3=ethernet, dual rj45 (2) 4=ethernet, 1 rj45 & 1 fber (2) 5=ethernet, dual fber (2) 6=iec 61850, dual rj45 (2) 7=iec 61850, 1 rj45 & 1 fber (2) 8=iec 61850, dual fber (2) 0=surface-mounted ngr monitor (4) 1=panel-mounted ngr monitor (5) 0=no ammeter 1=earth-leakage panel meter (2) 2=earth-leakage panel meter & pulse-enable switch (3) 0=no cpt 1=480/600-v cpt (1) neutral grounding resistor monitoring ngrm-enc series ngrm-enc note (1) - includes fuses, (2) - se-330 models only, (3) - se-330 models only, excluding se-330hv models, (4) - includes panel-mounted indication & reset, and usb connector for se-330 models, (5) - se-330 models only; includes ip65 hinged transparent cover protection relays & controls ? 2015 littelfuse protection relays & controls
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