400 Hz Transformers

4A Series

  • Category Power Transformer
  • Type Light Weight, High Altitude, Rugged Environment
  • Power Type Single Phase, 400 Hz
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4A Series Introduction

Built to meet the specifications of MIL-PRF-27, long life and reliability are major features of these encapsulated, ruggedly built power transformers. Encased in epoxy fiberglass and capable of operation at high temperatures, these units have a wide variety of uses in airborne, space, and missile applications, where small size and dependability are prime factors. The 4A Series comes in power levels of 7, 10, 25, 50, 120, and 150 watts at any voltage between 5 and 120 VAC.

For 3 Phase Equivalent, see 4D Series.

 

This series is factory configurable; please feel free to send us your special requirements.

Key Features

  • Unique Design allows for additional ouputs quickly and easily
  • MIL-PRF-27 Grade 5 Class S Construction
  • Designed for Light Weight and High Temperature Requirements of Airborne, Shipboard, and Ground Mobile Applications

Specifications

  • AC INPUT (VAC)
    115 VAC
    “A” Option: 230 V AC, Add suffix “A” to model number, e.g., 4A5-50A.
    “X” Option: Electrostatic shield grounded to core. Add “X” to model number, e.g., 4A5-50X.
  • AC INPUT (HZ)
    400Hz ± 20 Hz, 1 Phase
  • EFFICIENCY
    Ranges from 85% to 93% typical
  • REGULATION
    10% or less no load to full load
  • SECONDARY VOLTAGE TOLERANCE
    Within 5% when measured at full load and listed input
  • DIELECTRIC WITHSTANDING VOLTAGE
    1500 VAC
  • STANDARD POWER LEVELS (VA)
    7 to 150 watts
    Additional Power Levels Available upon Request
  • STANDARD OUTPUTS (VOLTS)
    5 to 120 volts
    Additional Outputs Available upon Request
  • OPERATING TEMPERATURE RANGE
    Maximum Ambient Temperature
    95°C maximum (Size 1 through 6)
    70°C maximum (Size 7)
  • CONSTRUCTION
    To MIL-PRF-27 Grade 5, Class S
  • MATERIALS/FINISHES
    Fiberglass Case, Epoxy
  • ENVIRONMENT
    Encapsulated to meet MIL-STD 810, including vibration, shock, sand, dust humidity, saltspray, fungus, sunshine, rain, explosion, and altitude (to a vac-uum). NOTE: For high altitude opera-tion, encapsulate terminals

Dimensions

Size A B C D E F G H J K
1
2
3
4
5
6
7 		1.37
1.50
1.75
2.00
2.43
2.81
2.81 		1.25
1.37
1.50
1.62
2.00
2.12
2.25 		1.31
1.37
1.56
1.81
2.10
2.43
2.43 		1.00
1.12
1.25
1.50
1.93
2.21
2.21 		.87
1.00
1.00
1.12
1.50
1.52
1.65 		0.19
0.19
0.25
0.25
0.25
0.30
0.30 		1.00
1.06
1.25
1.50
—
—
— 		1.19
1.25
1.44
1.69
1.90
2.23
2.23 		0.16
0.22
0.35
0.47
0.21
0.40
0.40 		4-40
4-40
6-32
6-32
6-32
8-32
8-32

Dimension tolerance = ±.02, except F, G, H, J = ±.04

Mechanical Drawings

 

Circuit Diagram

Basic Circuit

Series:  Connect 4 and 5

Parallel:  Connect 5 and 6

Load:  3 and 6

 

Standard Model List

Output Volts (F.L.) Parallel Connection Series Connection Size Weight Lbs. (Typical) Model Number QPL Model Number
5 V Parallel
10 VCT Series 		1.40
2.00
5.00
8.00
24.00
30.00 		0.70
1.00
2.50
4.00
12.00
15.00 		1
2
3
4
5
6 		0.26
0.30
0.47
0.77
1.6
2.0 		4A5-7
4A5-10
4A5-25
4A5-40
4A5-120
4A5-150 		M27/332-01
M27/333-01
M27/334-01
M27/335-01
M27/336-01
M27/337-10
6.3 V Parallel
12.6 VCT Series 		1.11
1.58
4.00
8.00
19.00
23.80
31.70 		0.55
0.79
2.00
4.00
9.50
11.90
15.85 		1
2
3
4
5
6
7 		0.26
0.30
0.47
0.77
1.6
2.0
2.2 		4A6-7
4A6-10
4A6-25
4A6-50
4A6-120
4A6-150
4A6-200 		M27/332-02
M27/333-02
M27/334-02
M27/335-02
M27/336-02
M27/337-02
M27/337-11
8 V Parallel
16 VCT Series 		0.87
1.25
3.12
6.24
15.00
18.70
25.00 		0.43
0.62
1.56
3.12
7.50
9.35
12.50 		1
2
3
4
5
6
7 		0.26
0.30
0.47
0.77
1.6
2.0
2.2 		4A8-7
4A8-10
4A8-25
4A8-50
4A8-120
4A8-150
4A8-200 		M27/332-03
M27/333-03
M27/334-03
M27/335-03
M27/336-03
M27/337-03
M27/337-12
10 V Parallel
20 VCT Series 		0.70
1.00
2.50
5.00
12.00
15.00
20.00 		0.35
0.50
1.25
2.50
6.00
7.50
10.00 		1
2
3
4
5
6
7 		0.26
0.30
0.47
0.77
1.6
2.0
2.2 		4A10-7
4A10-10
4A10-25
4A10-50
4A10-120
4A10-150
4A10-200 		M27/332-04
M27/333-04
M27/334-04
M27/335-04
M27/336-04
M27/337-04
M27/337-13
12 V Parallel
24 VCT Series 		0.58
0.84
2.08
4.16
10.00
12.50
16.70 		0.29
0.42
1.04
2.08
5.00
6.25
8.35 		1
2
3
4
5
6
7 		0.26
0.30
0.47
0.77
1.6
2.0
2.2 		4A12-7
4A12-10
4A12-25
4A12-50
4A12-120
4A12-150
4A12-200 		M27/332-05
M27/333-05
M27/334-05
M27/335-05
M27/336-05
M27/337-05
M27/337-14
17 V Parallel
34 VCT Series 		0.41
0.58
1.47
2.94
7.06
8.82
11.80 		0.20
0.29
0.73
1.47
3.53
4.41
5.90 		1
2
3
4
5
6
7 		0.26
0.30
0.47
0.77
1.6
2.0
2.2 		4A17-7
4A17-10
4A17-25
4A17-50
4A17-120
4A17-150
4A17-200 		M27/332-06
M27/333-06
M27/334-06
M27/335-06
M27/336-06
M27/337-06
M27/337-15
20 V Parallel
40 VCT Series 		0.35
0.50
1.25
2.50
6.00
7.50
10.00 		0.17
0.25
0.62
1.25
3.00
3.75
5.00 		1
2
3
4
5
6
7 		0.26
0.30
0.47
0.77
1.6
2.0
2.2 		4A20-7
4A20-10
4A20-25
4A20-50
4A20-120
4A20-150
4A20-200 		M27/332-07
M27/333-07
M27/334-07
M27/335-07
M27/336-07
M27/337-07
M27/337-16
28 V Parallel
56 VCT Series 		0.25
0.35
0.89
1.78
4.28
5.36
7.14 		0.12
0.17
0.44
0.89
2.14
2.68
3.57 		1
2
3
4
5
6
7 		0.26
0.30
0.47
0.77
1.6
2.0
2.2 		4A28-7
4A28-10
4A28-25
4A28-50
4A28-120
4A28-150
4A28-200 		M27/332-08
M27/333-08
M27/334-08
M27/335-08
M27/336-08
M27/337-08
M27/337-17
44 V Parallel
88 VCT Series 		0.15
0.22
0.56
1.12
2.72
3.40
4.54 		0.07
0.11
0.28
0.56
1.36
1.70
2.27 		1
2
3
4
5
6
7 		0.26
0.30
0.47
0.77
1.6
2.0
2.2 		4A44-7
4A44-10
4A44-25
4A44-50
4A44-120
4A44-150
4A44-200 		M27/332-09
M27/333-09
M27/334-09
M27/335-09
M27/336-09
M27/337-09
M27/337-18
60 V Parallel
120 VCT Series 		0.11
0.16
0.41
0.82
2.00
2.50
3.53 		0.05
0.08
0.20
0.41
1.00
1.25
1.66 		1
2
3
4
5
6
7 		0.26
0.30
0.47
0.77
1.6
2.0
2.2 		4A60-7
4A60-10
4A60-25
4A60-50
4A60-120
4A60-150
4A60-200 		M27/332-10
M27/333-10
M27/334-10
M27/335-10
M27/336-10
M27/337-10
M27/337-19