Low Temperature Rise Transformers - A high efficiency, low loss, low cost option.

As energy costs continue to rise, maximizing the efficiency of electrical distribution systems becomes a top priority. Transformer efficiency is determined by losses (heat). For a transformer to operate most efficiently, it must be designed to operate at the lowest possible heat output. The lower the heat, the lower the losses. Sola/Hevi-Duty's low temperature rise transformers feature a 220°C insulation system and temperature rise of only 80°C or 115°C under full nameplate load. The result is 13-21% lower operating losses than conventional 150°C rise units. With operating costs substantially reduced, you will save more each year over the transformer's normal life. Low losses and money savings are not the only benefits of Sola/Hevi-Duty low temperature rise transformers. The 35oC thermal reserve on 115°C rise units and 70°C reserve on 80°C rise units definitely mean lower operating costs. The extra benefit is being able to operate either of these transformers as a 15°C rise unit and have an overload capability of 15-30% without compromising normal life expectancy (See Figure 1).
Low temperature rise transformers are designed for any critical application requiring extra overload capability, lower than average total losses and/or cooler operating temperatures. All are available with either a 115°C or 80°C thermal rise and a fully coordinated class 220°C insulation system.

On this page: Features, Design Style, Single Phase Selection Tables, Three Phase Selection Tables

A printable version of the following section is available by selecting the pdf files to the left.

Features

• Shielded - for quality power
• UL-3R outdoor enclosure with optional weather shield
• Thermal reserve allows for continuous overload operation at 150°C rise
• Aluminum windings for greater insulation life
• Class 220°C insulation system, 115°C or 80°C rise
• Single and three phase availability

* Contact Technical Services for weather shield information.

Single Phase Selection Tables

KVA	Catalog Number 80oC Rise	Catalog Number 115oC Rise	NEMA 3R Weather Shield*	H (inch)	W (inch)	D (inch)	Ship Weight Approx. (lbs)	Elec Conn	Prim. Amps	Sec. Amps
15	S5HB15S	S5HF15S	WS-15	28	16	16	235	1	62.5/31.3	125/62.5
25	S5HB25S	S5HF25S	WS-17	31	18	18	280	1	104/52.1	208/104
37.5	S5HB37S	S5HF37S	WS-17	31	18	18	350	1	156/78	313/156
50	S5HB50S	S5HF50S	WS-09	44	23	21	605	1	208/104	416/208
75	S5HB75S	S5HF75S	WS-09	44	23	21	695	1	313/156	625/313
100	S5HB100S	S5HF100S	WS-16	46	26	24	930	1	417/208	833/417
*Weather shields come in a set of two and need to be ordered separately.

Groups 2 – 600 Volt Primary, 120/240 Secondary, 60 Hz

UL File:

KVA	Catalog Number 80oC Rise	Catalog Number 115oC Rise	NEMA 3R Weather Shield*	Height (inch)	Width (inch)	Depth (inch)	Ship Weight Approx. (lbs)	Elec Conn	Prim. Amps	Sec. Amps
15	S10HB15S	S10HF15S	WS-15	28	16	16	235	2	25.0	125/62.5
25	S10HB25S	S10HF25S	WS-17	31	18	18	280	2	41.7	208/104
37.5	S10HB37S	S10HF37S	WS-17	31	18	18	350	2	62.5	313/156
50	S10HB50S	S10HF50S	WS-09	44	23	21	605	2	83.3	416/208
75	S10HB75S	S10HF75S	WS-09	44	23	21	695	2	125	625/313
100	S10HB100S	S10HF100S	WS-16	46	26	24	930	2	167	833/417
*Weather shields come in a set of two and need to be ordered separately.

 

Three Phase Selection Tables

Groups A – 480 D Primary, 208Y/120 Secondary, 60 Hz (Aluminum)

UL File:

KVA	Catalog Number 80oC Rise	Catalog Number 115oC Rise	NEMA 3R Weather Shield*	Height (inch)	Width (inch)	Depth (inch)	Ship Weight Approx. (lbs)	Elec Conn	Prim. Amps	Sec. Amps
15	T2HB15S	T2HF15S	WS-14	28	23	16	245	3	18.1	41.7
30	T2HB30S	T2HF30S	WS-14	28	23	18	335	3	36.1	83.4
45	T2HB45S	T2HF45S	WS-30	34	28	22	495	3	54.2	125
75	T2HB75S	T2HF75S	WS-30	34	28	22	655	3	90.3	208
112.5	T2HB112S	T2HF112S	WS-10	44	33	21	970	3	135	313
150	T2HB150S	T2HF150S	WS-11	46	36	24	1240	3	181	417
225	T2HB225S	T2HF225S	WS-11	46	36	24	1390	3	271	625
300	T2HB300S	T2HF300S	WS-12	65	45	35	2340	3	361	834
*Weather shields come in a set of two and need to be ordered separately.

Groups B -480 D Primary, 240 D Secondary with 120 V Reduced                        Capacity Center Tap*, 60 Hz (Aluminum)

UL File:

KVA	Catalog Number 80oC Rise	Catalog Number 115oC Rise	NEMA 3R Weather Shield**	Height (inch)	Width (inch)	Depth (inch)	Ship Weight Approx. (lbs)	Elec Conn	Prim. Amps	Sec. Amps
15	T5HB15S	T5HF15S	WS-14	28	23	16	245	4	18.1	36.1
30	T5HB30S	T5HF30S	WS-14	28	23	18	335	4	36.1	72.3
45	T5HB45S	T5HF45S	WS-30	34	28	22	495	4	54.2	108
75	T5HB75S	T5HF75S	WS-30	34	28	22	655	4	90.3	181
112.5	T5HB112S	T5HF112S	WS-10	44	33	21	970	4	135	271
150	T5HB150S	T5HF150S	WS-11	46	36	24	1240	4	181	361
225	T5HB225S	T5HF225S	WS-11	46	36	24	1390	4	271	542
300	T5HB300S	T5HF300S	WS-12	65	45	35	2340	4	361	723
*See the Technical Notes section with respect to capacity of center tap. **Weather shields come in a set of two and need to be ordered separately.

Groups C – 480 D Primary, 208Y/120 Secondary, 60 Hz, Copper-Wound                           (Copper)

UL File:

KVA	Catalog Number 115oC Rise		NEMA 3R Weather Shield*	Height (inch)	Width (inch)	Depth (inch)	Ship Weight Approx. (lbs)	Design Style	Elec Conn	Prim. Amps	Sec. Amps
15	T2HF15SCU		WS-02	23	18	14	204	1	3	18.1	41.7
30	T2HF30SCU		WS-14	28	23	16	312	1	3	36.1	83.4
45	T2HF45SCU		WS-14	28	23	16	423	1	3	54.2	125.0
75	T2HF75SCU		WS-30	34	28	22	627	1	3	90.3	208.0
112.5	T2HF112SCU		WS-30	34	28	22	859	1	3	135.0	313.0
150	T2HF150SCU		WS-10	44	33	21	1332	1	3	181	417.0
225	T2HF225SCU		WS-11	46	36	24	1682	1	3	271	625.0
300	T2HF300SCU		WS-11	46	36	24	1863	1	3	361	834.0
500	T2HF500SCU		WS-12	65	45	35	3120	1	3	602	1390.0
*Weather shields come in a set of two and need to be ordered separately.

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