Sola/Hevi-Duty: Low Temperature Rise Transformers

Hevi-Duty 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° rise units. Reduction in temperature rise increases reliability.

The 35^oC 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 150°C rise unit and have an overload capability of 15-30% without compromising normal life expectancy (see Figure 2 below).

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: Accessories and Optional Design Styles, Selection Tables for 80°C Rise, Selection Tables for 115°C Rise

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

Figure 2

kVA	Catalog Number 80^oC Rise	NEMA 3R Weather Shield*	Height (inch)	Width (inch)	Depth (inch)	Ship Weight Approx. (lbs)	Design Style**	Elec Conn	Prim. Amps	Sec. Amps
15	ES5HB15S	WS-15	28	16	16	199	1	1	62.5/31.3	125/62.5
25	ES5HB25S	WS-17	31	18	18	239	1	1	104/52.1	208/104
37.5	ES5HB37S	WS-17	31	18	18	308	1	1	156/78	313/156
50	ES5HB50S	WS-09	44	23	21	398	1	1	208/104	416/208
75	S5HB75S	WS-09	44	23	21	560	1	1	313/156	625/313
100	ES5HB100S	WS-16	46	26	24	980	1	1	417/208	833/417
Weather shields come in a set of two and need to be ordered separately. *Design Style and Electrical Connections can be found by clicking the link or by selecting the pdf files to the left.

Group 2: 600 Volt Primary, 120/240 Secondary, 60 Hz

UL File:

kVA	Catalog Number 80^oC Rise	NEMA 3R Weather Shield	Height (inch)	Width (inch)	Depth (inch)	Ship Weight Approx. (lbs)	Design Style**	Elec Conn	Prim. Amps	Sec. Amps
15	ES10HB15S	WS-15	28	16	16	199	1	4	25.0	125/62.5
25	ES10HB25S	WS-17	31	18	18	239	1	4	41.7	208/104
37.5	ES10HB37S	WS-17	31	18	18	308	1	4	62.5	313/156
50	ES10HB50S	WS-09	44	23	21	398	1	4	83.3	416/208
75	ES10HB75S	WS-09	44	23	21	555	1	4	125	625/313
100	ES10HB100S	WS-16	46	26	24	980	1	4	167	833/417
Weather shields come in a set of two and need to be ordered separately. *Design Style and Electrical Connections can be found by clicking the link or by selecting the pdf file to the left.

Three Phase Selection Table (80^oC Rise)

Group A: 480 D Primary, 208Y/120 Secondary, 60 Hz

UL File:

kVA	Catalog Number 80^oC Rise	NEMA 3R Weather Shield*	Height (inch)	Width (inch)	Depth (inch)	Ship Weight Approx. (lbs)	Design Style**	Elec Conn	Prim. Amps	Sec. Amps
15	ET2HB15S	WS-14	28	23	16	305	1	2	18.1	41.7
30	ET2HB30S	WS-14	28	23	18	405	1	2	36.1	83.4
45	ET2HB45S	WS-30	34	28	22	535	1	2	54.2	125
75	ET2HB75S	WS-30	34	28	22	805	1	2	90.3	208
112.5	ET2HB112S	WS-10	44	33	21	972	1	2	135	313
150	ET2HB150S	WS-11	46	36	24	1325	1	2	181	417
225	ET2HB225S	WS-11	46	36	24	1515	1	2	271	625
300	ET2HB300S	WS-12	65	45	35	2460	1	2	361	834
Weather shields come in a set of two and need to be ordered separately. *Design Style and Electrical Connections can be found by clicking the links above.

Selection Tables (115^oC Rise)

Group 1: 240 x 480 Volt Primary, 120/240 Secondary, 60 Hz

UL File:

kVA	Catalog Number 115^oC Rise	NEMA 3R Weather Shield*	Height (inch)	Width (inch)	Depth (inch)	Ship Weight Approx. (lbs)	Design Style**	Elec Conn	Prim. Amps	Sec. Amps
15	ES5HF15S	WS-15	28	16	16	175	1	1	62.5/31.3	125/62.5
25	ES5HF25S	WS-17	28	16	16	265	1	1	104/52.1	208/104
37.5	ES5HF37S	WS-17	31	18	18	340	1	1	156/78	313/156
50	ES5HF50S	WS-09	31	18	18	425	1	1	208/104	416/208
75	ES5HF75S	WS-09	44	23	21	655	1	1	313/156	625/313
100	ES5HF100S	WS-09	44	23	21	750	1	1	417/208	833/417
167	ES5HF167S	WS-16	46	26	24	980	1	1	695/348	1392/695
Weather shields come in a set of two and need to be ordered separately. *Design Style and Electrical Connections can be found by clicking the links above.

Group 2: 600 Volt Primary, 120/240 Secondary, 60 Hz

UL File:

kVA	Catalog Number 115^oC Rise	NEMA 3R Weather Shield*	Height (inch)	Width (inch)	Depth (inch)	Ship Weight Approx. (lbs)	Design Style**	Elec Conn	Prim. Amps	Sec. Amps
15	ES10HF15S	WS-15	23	16	16	175	1	4	25	125/62.5
25	ES10HF25S	WS-15	28	16	16	265	1	4	41.7	208/104
37.5	ES10HF37S	WS-17	31	18	18	340	1	4	62.5	313/156
50	ES10HF50S	WS-17	31	18	18	425	1	4	83.3	416/208
75	ES10HF75S	WS-09	44	23	21	655	1	4	125	625/313
100	ES10HF100S	WS-09	44	23	21	750	1	4	167	833/417
167	ES10HF100S	WS-16	46	26	24	980	1	4	278	1392/695
Weather shields come in a set of two and need to be ordered separately. *Design Style and Electrical Connections can be found by clicking the link or by selecting the pdf files to the left.

Three Phase Selection Table (115^oC Rise)

Group A: 480 D Primary, 208Y/120 Secondary, 60 Hz

UL File:

kVA	Catalog Number 115^oC Rise	NEMA 3R Weather Shield*	Height (inch)	Width (inch)	Depth (inch)	Ship Weight Approx. (lbs)	Design Style**	Elec Conn	Prim. Amps	Sec. Amps
15	ET2HF15S	WS-02	23	18	14	187	1	2	18.1	41.7
30	ET2HF30S	WS-14	28	23	18	292	1	2	36.1	83.4
45	ET2HF45S	WS-14	28	23	16	376	1	2	54.2	125
75	ET2HF75S	WS-30	34	28	22	569	1	2	90.3	208
112.5	ET2HF112S	WS-30	34	28	22	768	1	2	135	313
150	ET2HF150S	WS-10	44	33	21	933	1	2	181	417
225	ET2HF225S	WS-11	46	36	24	1342	1	2	271	625
300	ET2HF300S	WS-11	46	36	24	1525	1	2	361	834
500	ET2HF500S	WS-12	65	45	35	2460	1	2	602	1390
Weather shields come in a set of two and need to be ordered separately. *Design Style and Electrical Connections can be found by clicking the link or by selecting the pdf files to the left.