Control Transformers

Catalogs > Industrial Controls Catalog > Power Supplies > Control Transformers > Bulletin 1497 — Global Control Transformers

Bulletin 1497 — Global Control Transformers

Introduction Standards Compliance and Certifications Cat. No. Explanation Product Selection Approximate Dimensions
Build a Catalog Number


Selecting a Control Circuit Transformer

For proper transformer selection, three characteristics of the load circuit must be determined in addition to the minimum voltage required to operate the circuit. These are total steady-state (sealed) VA, total inrush VA, and inrush load power factor.


Selection Process

1.  Determine the total inrush VA of the control circuits from the table below. Do not neglect the current requirements of indicating lights and other devices that do not have an inrush VA but are re-energized at the same time as the other components in the circuit. Their total VA should be added to the total inrush VA.

2.  Refer to the table below, Regulation DataInrush VA. If the supply circuit voltage (Step 1) is reasonably stable and fluctuates not more than ± 5%, refer to the 90% secondary voltage column. If it fluctuates as much as ± 10%, refer to the 95% secondary voltage column. Go down the column selected until at the inrush VA closest to, but not less than, the inrush VA of the control circuit.

3.  Read to the far left side of the chart. The transformer’s continuous nominal VA rating is now selected. The secondary voltage that will be delivered under inrush conditions will be either 85%, 90%, or 95% of the rated secondary voltage, depending on the column selected from the table below, Regulation DataInrush VA. The total sealed VA of the control circuit must not exceed the nominal VA rating of the transformer selected from the table below, Typical Magnetic Motor Starter and Contactor Data 60 Hz, 120 Volt, 3-Pole.

4.  Refer to the specification tables on the following pages to select a transformer according to the required continuous nominal VA, and primary and secondary voltage combinations.


Regulation Data — Inrush VA

Inrush VA at 40% Power Factor Power Factor Adjustments
Nominal VA Rating 85% 90% 95% Power Factor Multiply By
63 347 289 216 100% 0.64
80 338 290 229 90% 0.67
130 907 745 541 80% 0.71
200 1267 1039 754 70% 0.78
250 1394 1116 781 60% 0.82
350 2870 2298 1584 50% 0.91
500 3786 3013 2065 40% 1.00
750 7360 5763 3786 30% 1.11
800 7360 5763 3786 20% 1.29
1000 8837 6785 4329 10% 1.50
1600 14921 11328 7070
2000 20500 14850 9100
  

Typical Magnetic Motor Starter and Contactor Data 60 Hz, 120 Volt, 3-Pole

Contactor NEMA Size
0 1 2 3 4 5  
Bulletin 500 192 192 240 660 1225 1490 VA Inrush
29 29 29 45 69 96 VA Sealed
  

Note:Refer to Selecting a Control Circuit Transformer for information on how to select a control circuit transformer.

Continuous VA Cat. Nos.
Primary
208V (60 Hz)
Primary
240V (60 Hz)/220V (50 Hz)
Primary
240X480V (60 Hz) or 220X440V (50 Hz)
208V 240V/
220V
Click to enlarge - 1497-1_232-3
Click to enlarge - 1497-1_232-1 Click to enlarge - 1497-1_232-1
24V or
120V
24V or
120V/110V
Secondary
24V (60 Hz)
Secondary
120V (60 Hz)
Secondary
26V (60 Hz)/
24V (50 Hz)
Secondary
120V (60 Hz)/
110V (50 Hz)
Secondary
26V (60 Hz) or
24V (50 Hz)
Secondary
120V (60 Hz) or
110V (50 Hz)
63 1497-A-HXJX-0-N 1497-A-HXDX-0-N 1497-A-AXJK-0-N 1497-A-AXSX-0-N 1497-A-BAJK-0-N 1497-A-BASX-0-N
80 1497-B-HXJX-0-N 1497-B-HXDX-0-N 1497-B-AXJK-0-N 1497-B-AXSX-0-N 1497-B-BAJK-0-N 1497-B-BASX-0-N
130 1497-C-HXJX-0-N 1497-C-HXDX-0-N 1497-C-AXJK-0-N 1497-C-AXSX-0-N 1497-C-BAJK-0-N 1497-C-BASX-0-N
200 1497-D-HXJX-0-N 1497-D-HXDX-0-N 1497-D-AXJK-0-N 1497-D-AXSX-0-N 1497-D-BAJK-0-N 1497-D-BASX-0-N
250 1497-E-HXJX-0-N 1497-E-HXDX-0-N 1497-E-AXJK-0-N 1497-E-AXSX-0-N 1497-E-BAJK-0-N 1497-E-BASX-0-N
350 1497-F-HXJX-0-N 1497-F-HXDX-0-N 1497-F-AXJK-0-N 1497-F-AXSX-0-N 1497-F-BAJK-0-N 1497-F-BASX-0-N
500 1497-G-HXJX-0-N 1497-G-HXDX-0-N 1497-G-AXJK-0-N 1497-G-AXSX-0-N 1497-G-BAJK-0-N 1497-G-BASX-0-N
750 1497-H-HXJX-0-N 1497-H-HXDX-0-N 1497-H-AXJK-0-N 1497-H-AXSX-0-N 1497-H-BAJK-0-N 1497-H-BASX-0-N
800 1497-J-HXJX-0-N 1497-J-HXDX-0-N 1497-J-AXJK-0-N 1497-J-AXSX-0-N 1497-J-BAJK-0-N 1497-J-BASX-0-N
1000 1497-K-HXJX-0-N 1497-K-HXDX-0-N 1497-K-AXJK-0-N 1497-K-AXSX-0-N 1497-K-BAJK-0-N 1497-K-BASX-0-N
1600 1497-L-HXDX-0-N 1497-L-AXSX-0-N 1497-L-BASX-0-N
2000 1497-M-HXDX-0-N 1497-M-AXSX-0-N 1497-M-BASX-0-N
With 2-Pole Primary and 1-Pole Secondary Top-Mounted Fuse Block ∆  — Fuses Not Included
63 1497-A-HXJX-3-N 1497-A-HXDX-3-N 1497-A-AXJK-3-N 1497-A-AXSX-3-N 1497-A-BAJK-3-N 1497-A-BASX-3-N
80 1497-B-HXJX-3-N 1497-B-HXDX-3-N 1497-B-AXJK-3-N 1497-B-AXSX-3-N 1497-B-BAJK-3-N 1497-B-BASX-3-N
130 1497-C-HXJX-3-N 1497-C-HXDX-3-N 1497-C-AXJK-3-N 1497-C-AXSX-3-N 1497-C-BAJK-3-N 1497-C-BASX-3-N
200 1497-D-HXJX-3-N 1497-D-HXDX-3-N 1497-D-AXJK-3-N 1497-D-AXSX-3-N 1497-D-BAJK-3-N 1497-D-BASX-3-N
250 1497-E-HXJX-3-N 1497-E-HXDX-3-N 1497-E-AXJK-3-N 1497-E-AXSX-3-N 1497-E-BAJK-3-N 1497-E-BASX-3-N
350 1497-F-HXJX-3-N 1497-F-HXDX-3-N 1497-F-AXJK-3-N 1497-F-AXSX-3-N 1497-F-BAJK-3-N 1497-F-BASX-3-N
500 1497-G-HXJX-3-N 1497-G-HXDX-3-N 1497-G-AXJK-3-N 1497-G-AXSX-3-N 1497-G-BAJK-3-N 1497-G-BASX-3-N
  
∆ Top-mounted fuse blocks are not available for transformers 750VA and higher.

Note:Refer to Selecting a Control Circuit Transformer for information on how to select a control circuit transformer.

Continuous VA Cat. Nos.
Primary⋆ 
600V (60 Hz)/550V (50 Hz)
Primary
380V, 400V, 415V (50 Hz)
  Click to enlarge - 1497-1_233-2
550V
600V
Click to enlarge - 1497-1_233-1
24V or
120V/110V
 
Secondary
26V (60 Hz)/24V (50 Hz)
Secondary
120V (60 Hz)/110V (50 Hz)
Secondary
115V/230V (50 Hz)
63 1497-A-CXJK-0-N 1497-A-CXSX-0-N 1497-A-M4-0-N
80 1497-B-CXJK-0-N 1497-B-CXSX-0-N 1497-B-M4-0-N
130 1497-C-CXJK-0-N 1497-C-CXSX-0-N 1497-C-M4-0-N
200 1497-D-CXJK-0-N 1497-D-CXSX-0-N 1497-D-M4-0-N
250 1497-E-CXJK-0-N 1497-E-CXSX-0-N 1497-E-M4-0-N
350 1497-F-CXJK-0-N 1497-F-CXSX-0-N 1497-F-M4-0-N
500 1497-G-CXJK-0-N 1497-G-CXSX-0-N 1497-G-M4-0-N
750 1497-H-CXJK-0-N 1497-H-CXSX-0-N 1497-H-M4-0-N
800 1497-J-CXJK-0-N 1497-J-CXSX-0-N 1497-J-M4-0-N
1000 1497-K-CXJK-0-N 1497-K-CXSX-0-N 1497-K-M4-0-N
1600 1497-L-CXSX-0-N 1497-L-M4-0-N
2000 1497-M-CXSX-0-N 1497-M-M4-0-N
With 2-Pole Primary and 1-Pole Secondary Top-Mounted Fuse Block ∆  — Fuses Not Included
63 1497-A-CXJK-3-N 1497-A-CXSX-3-N 1497-A-M4-3-N
80 1497-B-CXJK-3-N 1497-B-CXSX-3-N 1497-B-M4-3-N
130 1497-C-CXJK-3-N 1497-C-CXSX-3-N 1497-C-M4-3-N
200 1497-D-CXJK-3-N 1497-D-CXSX-3-N 1497-D-M4-3-N
250 1497-E-CXJK-3-N 1497-E-CXSX-3-N 1497-E-M4-3-N
350 1497-F-CXJK-3-N 1497-F-CXSX-3-N 1497-F-M4-3-N
500 1497-G-CXJK-3-N 1497-G-CXSX-3-N 1497-G-M4-3-N
  
⋆ Transformers 500…800VA with 500V primary do not carry the CE mark.
∆ Top-mounted fuse blocks are not available for transformers 750VA and higher.

Fuse Sizing Charts

Important: Select the fuse to protect the control circuit conductors in accordance with the National Electrical Code.

Primary Fuse Sizing Chart (When Only Primary Protection is Used)

Maximum Amp Rating for Current Limiting Fuses Based on Transformer Primary Voltage and the National Electrical Code

VA 208V 220V 240V 277V 347V 380V 400V 415V 440V 480V 500V 550V 600V 690V
63 0.75 0.75 0.75 0.5 0.5 0.4 0.4 0.4 0.4 0.25 0.25 0.25 0.25 0.25
80 1 1 1 0.75 0.5 0.5 0.5 0.5 0.5 0.5 0.4 0.4 0.4 0.25
130 1.5 1.5 1.5 1.25 1 1 0.75 0.75 0.75 0.75 0.75 0.5 0.5 0.5
200 2.5 2.5 2.5 2 1.5 1.5 1.5 1.25 1.25 1.25 1 1 1 0.75
250 3 3 3 2.5 2 1.5 1.5 1.5 1.5 1.5 1.5 1.25 1.25 1
350 5 4 4 3 3 2.5 2.5 2.5 2 2 2 1.5 1.5 1.5
500 4 3 3 5 4 3 3 3 3 3 3 2.5 2.5 2
750 6 5 5 4 3 5 5 5 5 4 4 4 3 3
800 6 6 5 4 3 3 3 5 5 5 4 4 4 3
1000 8 7 6 6 4 4 4 4 3 3 3 5 5 4
1600 12 12 11 9 7 7 6 6 6 5 5 4 4 3
2000 12 11 13 12 9 8 8 8 7 6 6 6 5 4
  

Primary Fuse Sizing Chart (When Primary and Secondary Protection is Used)

Maximum Amp Rating for Current Limiting Fuses Based on Transformer Primary Voltage and the National Electrical Code

VA 208V 220V 240V 277V 347V 380V 400V 415V 440V 480V 500V 550V 600V 690V
63 0.75 0.75 0.5 0.5 0.4 0.4 0.4 0.4 0.3 0.3 0.3 0.25 0.25 0.25
80 1.5 1.5 1.5 1 1 1 1 0.75 0.75 0.75 0.75 0.5 0.5 0.5
130 3 2.5 2.5 2 1.5 1.5 1.5 1.5 1.25 1.25 1.25 1 1 0.75
200 4 4 4 3 2.5 2.5 2.5 2 2 2 2 1.5 1.5 1
250 6 5 5 4 3 3 3 3 2.5 2.5 2.5 2 2 1.5
350 8 7 7 6 5 4 4 4 3 3 3 3 2.5 2.5
500 6 5 5 9 7 6 6 6 5 5 5 4 4 3
750 9 8 7 6 5 9 9 9 8 7 7 6 6 5
800 9 9 8 7 5 5 5 8 8 8 8 7 6 5
1000 12 10 10 9 7 6 6 6 5 5 5 8 8 7
1600 15 15 15 12 11 10 10 9 9 8 8 7 6 5
2000 20 20 20 18 14 12 12 12 10 10 10 9 8 7
  

Secondary Fuse Sizing Chart

Maximum Amp Rating for Current Limiting Fuses Based on the National Electrical Code

VA 24V 110V 115V 120V 230V
63 4 0.75 0.75 0.75 0.4
80 5 1 1 1 0.5
130 9 1.8 1.8 1.8 0.9
200 13 2.5 2.5 2.5 1.25
250 15 3.2 3.2 3.2 1.5
350 20 4.5 4.5 4.5 2.5
500 30 6.25 6.25 6.25 3
750 45 9 9 9 4.5
800 45 9 9 9 4.5
1000 60 12 12 12 6
1600 100 20 20 20 10
2000 25 25 25 12