Surge Protection

NF Main Lugs Panelboard with Integral SPD

The Surgelogic™ IMA series surge protective device is a modular parallel surge protective device (SPD). The IMA device is a multi-stage suppression circuit consisting of field-proven, fast-acting, 34 mm metal oxide varistors (MOVs).

A surge suppression path is provided for each mode, line-to-neutral (L-N), line-to-line (L-L), line-to-ground (L-G), and neutral-to-ground (N-G). Each surge suppression mode is individually fused and uses circuitry with thermal cutouts to isolate the SPD and ensure shutdown in the event of MOV damage during severe overvoltages, even when operated on high fault current power systems.

The suppression elements are encapsulated in a UL recognized potting material—another performance element that provides additional protection. A filter provides a high level of EMI/RFI noise attenuation. On-line diagnostics continuously monitor the device status, and LEDs signal loss of a suppression circuit. An audible alarm with an enable/disable feature and dry contacts are included in the standard diagnostic package.

NF442L2TVS416C

Ready to Install NF Interiors with SPD

Mains Rating	Max Circuit Breaker Spaces	SPD Rating		Interior Catalog Number*	Components for Adding a Vertical Main Circuit Breaker
Mains Rating	Max Circuit Breaker Spaces	Voltage (Vac)	Surge Current Rating (kA)	Interior Catalog Number*	Main Circuit Breaker Kit	Main Circuit Breaker Frames
250 A	42	480Y/277 Vac	160	NF442L2TVS416C	N150MH* N250MJ	HD, HG, HJ, HL, or HR JD, JG, JJ, JL, or JR
250 A	42	600Y/347 Vac	120	NF442L2TVS812C	N150MH* N250MJ	HD, HG, HJ, HL, or HR JD, JG, JJ, JL, or JR
400 A	42	480Y/277 Vac	160	NF442L4TVS416C	N400M	LAL, LHL
400 A	42	600Y/347 Vac	120	NF442L4TVS812C	N400M	LAL, LHL

IMA Series Voltage Specifications

Service Voltage*	UL Suppression Voltage Rating (SVR)
Service Voltage*	L–N	L–G	N–G	L–L	MCOV *
120/240 Vac, 1-phase	400	400	400	800	150
208Y/120 Vac, 3-phase, 4-wire	400	400	400	800	150
240/120 Vac, 3-phase, high-leg delta	800/400	800/400	400	1500/800	275/150
480Y/277 Vac, 3-phase, 4-wire	800	800	800	1600	320
600Y/347 Vac, 3-phase, 4-wire	1200	1200	1200	2000	420

Performance Features

Surge Capacity	L–N	L–G	N–G (3-Phase Rating)
100 kA / phase	50 kA	50 kA	100 kA
120 kA / phase	60 kA	60 kA	120 kA
160 kA / phase	80 kA	80 kA	120 kA
200 kA / phase	100 kA	100 kA	200 kA
240 kA / phase	120 kA	120 kA	120 kA

Design Features

Individually fused suppression modules
Thermal cutout
Inline, copper bus bar connection
Solid state bi-directional
Push-to-Test on-line diagnostic display
Audible alarm with enable/disable switch, provides audible indication that there is a loss of protection
LED indicators indicate loss of protection, or fully operational circuit
High-energy parallel design for IEEE C62.41 category A, B, and C3 applications
Available in main circuit breaker and main lug only panelboards with sub-feed circuit breakers, feed-through lugs, or sub-feed lugs.
AC tracking filter with EMI/RFI filtering up to -50 dB from 100 kHz to 100 MHz
Dry Contacts provide remote indication of the SPD device’s operating status to a computer interface board or emergency management system.

Options

Option	Description
Surge Counter	Displays the combined total number of transient voltage surges detected from L–G, L–L, L–N, and N–G since the counter was last reset.
Remote Monitor	Displays the alarm status of the surge protective device up to 1,000 ft. (305 m) away from the unit. This option uses the dry contacts.