Solar-Catalog.com 2008
Disconnects, Fuses, Fuse Holders, and Breakers
Catalog Contents
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According to the National Electric Code, section 690.15, PV arrays must have a disconnecting means to isolate the inverter from the PV power source. Utility intertie inverters that utilize PV arrays with voltages above 250VDC require a disconnect rated for 600VDC to perform this function. The Square-D 600 VDC 30 amp 3-pole safety switches are UL listed to handle 13A at 600VDC per pole. They can be used for disconnecting up to three PV arrays for three grid-tie inverters. It has wiring lugs that are rated to accept two #14 to #10 wires in each lug. This allows the disconnect switch to also act as a string combiner in systems that utilize two strings of PV modules per inverter. All other Square D 600 VDC disconnects are rated for disconnecting one string at full rated power.

Many utilities require an AC disconnect between an intertie inverter and the AC load center, close to the AC service entrance, with a visible and lockable handle. A 30 amp 240 volt disconnect is good for up to 5kW at 240 VAC (one or two 2500W intertie inverters) and the 60 amp disconnect is good for up to 12.5kW (three to five 2500W intertie inverters). For connection of multiple inverters to one of these disconnects, use an AC load center, with a circuit breaker for each inverter installed, as an AC combiner box between the inverters and the disconnect switch. The breakers can be back-fed with the inverter outputs and the load center main lugs will handle the combined outputs to be connected to the AC disconnect.

Use Class-R fuses of the proper amperage for fused disconnects. Use the hubs on the next page to connect conduit or a kWh meter socket to the top of the disconnect. Disconnects are raintight (NEMA 3R) for outdoor use. Order the neutral bus bar and ground bus bar if you need to land these conductors in the disconnect switch box. See next page for accessories.

Amps	AC / DC	Fused	Poles	Neutral Kit	Ground Kit	Dimensions (in.) H x W x D	Weight (lbs.)	Square-D Model	Item Code	Price	Purchase
600 Volt AC or DC 3 Pole NEMA 3R Heavy Duty Switches
30	Yes	No	3*	SN03	GTK03	14.88 x 6.63 x 4.88	9.3	HU361RB	53.2312	$165
30	Yes	Yes	3*	SN03	GTK03	14.88 x 6.63 x 4.88	9.8	H361RB	53.2313	$260
* Uses 2 poles in series for 600VDC, except for pv where all 3 poles may be used for 600 VDC at 13 amps per pole
60	Yes	No	3**	SN0610	GTK0610	17.50 x 9.00 x 6.38	16	HU362RB	53.2339	$380
60	Yes	Yes	3**	SN0610	GTK0610	17.50 x 9.00 x 6.38	16	H362RB	53.2341	$480
100	Yes	No	3**	SN0610	GTK0610	21.25 x 8.50 x 6.38	24	HU363RB	53.2357	$530
100	Yes	Yes	3**	SN0610	GTK0610	21.25 x 8.50 x 6.38	24	H363RB	53.2355	$750
200	Yes	No	3**	SN20A	PKOGTA2	29.25 x 17.25 x 8.50	44	HU364RB	53.2364	$640
200	Yes	Yes	3**	SN20A	PKOGTA2	29.25 x 17.25 x 8.50	44	H364RB	53.2374	$1,025
** Uses 2 poles (and 2 fuses) in series for 600VDC
240 Volt AC / 125 Volt DC*** NEMA 3R Heavy Duty Switches
30	Yes	Yes	3	Included	GTK03	14.88 x 6.63 x 4.88	9.8	H321NRB	53.2315	$314
60	Yes	Yes	3	Included	GTK03	14.88 x 6.63 x 4.88	10	H322NRB	53.2336	$503
100	Yes	Yes	3	Included	GTK0610	21.25 x 8.50 x 6.38	19	H323NRB	53.2351	$722
200	Yes	Yes	3	Included	PKOGTA2	29.25 x 17.25 x 8.50	43	H324NRB	53.2363	$988
*** Switches are rated for 250VDC but available fuses are only rated for 125VDC
240 Volt AC only NEMA 3R General Duty Switches
30	AC Only	No	2	N/A	PK3GTA1	9.63 x 7.25 x 3.75	4.4	DU221RB	53.2318	$83
30	AC Only	Yes	2	Included	PK3GTA1	9.63 x 7.25 x 3.75	4.5	D221NRB	53.2326	$90
30	AC Only	No	3	N/A	PK3GTA1	9.63 x 7.25 x 3.75	4.7	DU321RB	53.2319	$139
30	AC Only	Yes	3	Included	PK3GTA1	9.63 x 7.25 x 3.75	5.1	D321NRB	53.2329	$139
60	AC Only	Yes	2	Included	GTK03	14.88 x 6.63 x 4.88	9.7	D222NRB	53.2334	$141
60	AC Only	No	3	N/A	PK3GTA1	9.63 x 7.25 x 3.75	5	DU322RB	53.2342	$222
60	AC Only	Yes	3	Included	GTK03	14.88 x 6.63 x 4.88	9.8	D322NRB	53.2343	$210
100	AC Only	Yes	2	Included	GTK0610	17.50 x 8.50 x 6.50	16	D223NRB	53.2358	$227
100	AC Only	No	3	N/A	GTK0610	17.50 x 8.50 x 6.50	15	DU323RB	53.2359	$386
100	AC Only	Yes	3	Included	GTK0610	17.50 x 8.50 x 6.50	16	D323NRB	53.2361	$386
200	AC Only	Yes	2	Included	PKOGTA2	29.25 x 17.25 x 8.25	29	D224NRB	53.2371	$513
200	AC Only	Yes	3	Included	PKOGTA2	29.25 x 17.25 x 8.25	30	D324NRB	53.2372	$853

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Field installable service ground and neutral bus bars and hubs for the safety disconnect switches on the previous page. See table to determine which neutral and ground to use.

Neutral & Ground Accessories	Item Code	Price	Purchase
SN03 Neutral Bus Bar	53.2389	$52
SN0610 Neutral Bus Bar	53.2381	$71
SN20ANeutral Bus Bar	53.2383	$133
GTK03 Ground Bus Bar	53.2387	$8
PK3GTA1 Ground Bus Bar	53.2395	$8
GTK0610 Ground Bus Bar	53.2386	$13
PKOGTA2 Ground Bus Bar	53.2388	$38
Conduit Hubs	Item Code	Price	Purchase
Top Mount Hub 3/4"	53.2305	$22
Top Mount Hub 1"	53.2306	$22
Top Mount Hub 1-1/4"	53.2307	$22
Top Mount Hub 1-1/2"	53.2308	$22
Top Mount Hub 2"	53.2309	$40

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These Class-R fuses can be used in AC circuits up to 250V or DC circuits up to 125V. They have the high amp interrupting capacity (AIC) required for fusing circuits powered by batteries and for protecting Square-D brand circuit breakers. They can be be used to protect wiring to small inverters (100-700 watts) and wiring from charging sources. Use these fuses in fused safety disconnect switches on the previous page and in the fuse blocks at right. UL listed

Amps	250VAC/125VDC			600VAC/VDC
	Item Code	Price	Purchase	Item Code	Price	Purchase
10	53.2441	$5		53.2442	$11
15	53.2444	$5		53.2447	$11
20	53.2450	$5		53.2453	$11
30	53.2456	$5		53.2459	$11
40	53.2462	$8		53.2463	$24
50	53.2465	$8		53.2466	$24
60	53.2468	$8		53.2471	$24
70	53.2469	$18		53.2470	$46
80	53.2475	$18		53.2472	$46
90	53.2476	$18		53.2473	$46
100	53.2474	$18		53.2477	$46
125	53.2478	$48		53.2481	$80
150	53.2479	$48		53.2482	$80
200	53.2480	$48		53.2483	$80

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Class R Fuse Blocks

Use these fuse blocks with the Class-R 250 volt fuses. Bare wire ends fit into the screw terminals on each end of the fuse block. The small fuse block holds 10-30A fuses and accepts up to #2 wire. The medium size block holds 40-60A fuses and accepts up to #2 wire also. The large size block holds a 100A fuse and accepts up to #1/0 wire. Small and medium size blocks are available in one or two pole versions.

Description	Item Code	Price	Purchase
Class R Fuse Block 0.1-30A, 1-Pole	53.2423	$5
Class R Fuse Block 0.1-30A, 2-Pole	53.2426	$12
Class R Fuse Block 31-60A, 1-Pole	53.2429	$9
Class R Fuse Block 31-60A, 2-Pole	53.2432	$16
Class R Fuse Block 61-100A, 1-Pole	53.2435	$25

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Inline ATC Fuse Holder

The waterproof cover makes this an excellent choice to fuse a single circuit, indoors or out. Cut wire loop and splice into the line to be protected. We recommend these with 1 amp fuses below in the positive power line for Trimetric, Link and Trace TM500A meters. Low voltage DC use only.

Description	Item Code	Price	Purchase
ATC Inline Holder 18 awg	53.2663	$3.00
ATC Inline Holder 10 awg	53.2669	$5.00

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ATC blade-type fuses were designed for low voltage DC circuits for the automotive industry. They are very popular in autos and RVs. They are not approved by the National Electrical Code for use in homes, but they are often used to provide circuit protection in remote cabin power systems.

They are sold in boxes of 10 fuses.

Description	Item Code	Price	Purchase
ATC Fuse 1A	53.2629	$0.65
ATC Fuse 3A	53.2631	$0.65
ATC Fuse 5A	53.2633	$0.65
ATC Fuse 10A	53.2635	$0.65
ATC Fuse 15A	53.2637	$0.65
ATC Fuse 20A	53.2639	$0.65
ATC Fuse 30A	53.2641	$0.65

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DC OVERCURRENT PROTECTION

Xantrex DC Disconnect

The Xantrex DC Disconnect is a white, powder-coated indoor enclosure with conduit knockouts for connection to inverters, batteries, DC charging sources, charge controllers and DC load centers. It comes with one 175A or 250A circuit breaker for an inverter (with space for a second breaker for a second inverter - order separately) that meets the National Electric Code requirements for disconnection and overcurrent protection of battery-based power systems. There are knockouts on the sides for four 15 to 100 amp DC breakers used for charging sources and DC loads.

Use the DC Bonding Block (DCBB - order separately below) for connecting the negative cables and for single-point DC system grounding.

There are pre-drilled places inside for two metering shunts. Knock-outs on the top are provided for mounting two Xantrex C-Series or OutBack MX-60 PV charge controllers, or one RVPP Solar Boost PV charge controller. Knockouts on the sides are designed for mounting two Xantrex SW, SW-Plus, or DR inverter/chargers with their optional conduit boxes and 2" offset nipples.

Order 175A or 250A DC surface mount circuit breakers listed below for adding second inverter breaker. Order 15A to 100A DC panel mount circuit breakers to use in the DC Disconnect side spaces.

Use the DC175 for the Xantrex SW4048, SW-Plus 2524 & 2548, DR1512, DR1524, and DR2424 inverters.

Use the DC250 for the Xantrex SW4024, SW5548, DR2412, and DR2436 inverters.

ETL listed to UL508.

Dimensions: 21""H x 10.5""W x 5""D.

Weight: 14 lbs

Xantrex Model	Description	Item Code	Price	Purchase
DC250	Xantrex 250A DC Disconnect	30.1414	$329
DC175	Xantrex 175A DC Disconnect	30.1411	$329
DCBB	DC Bonding Block	30.1417	$50

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These single pole circuit breakers are UL listed for use in DC circuits with voltages up to 125VDC. They are commonly used in DC power centers as overcurrent protection and disconnecting means between PV arrays and charge controllers, between charge controllers and batteries, between other DC charging sources (such as wind and hydro generators) and batteries, and as outputs to DC loads. They have the high amp interrupting capacity (AIC) needed between batteries and Square-D QO and QOU circuit breakers and load centers for 12V and 24V systems.

Breakers are Heinneman, Airpax, or Carlingswitch brand.

They are available in two different configurations: