Bulletin M-1
General Description: Ordering Instructions:
* Machine Type Transformer * Order by model number shown
* Frame Cross Section 7 1/4" X 9 1/4" * Add "X" to model number if transformer is to be fully potted
* Specify tap switch position on 5-way mount models
Wound Core
KVA Rating Secondary No. of Tap Switch RWMA Model Number Weight Dwg. Frame Turns Ratio 440 Volt
110 C Rise Voltage Taps Location Pad Size 220V/60 Hz 440V/60 Hz Approx. No. Letter Tap 1 Tap 2 Tap 3 Tap 4 Tap 5
  2.5 to 4.8   End Mount 1 M22630A1BMW M44630A1BMW 142 R1308            
30 Volts 5             A          
      5 Way Mount 1 M22630A1DMW M44630A1DMW 147 R1307            
                             
  3.2 to 5.8   End Mount 1 M22640E1BMW M44640E1BMW 158 R1308            
40 Volts 5             E 137:1 119:1 102:1 88:1 76:1
      5 Way Mount 1 M22640E1DMW M44640E1DMW 163 R1307            
                             
  3.5 to 6.9   End Mount 1 M22650B1BMW M44650B1BMW 178 R1308            
50 Volts 5             B 123:1 106:1 89:1 74:1 63:1
      5 Way Mount 1 M22650B1DMW M44650B1DMW 183 R1307            
                             
Stacked Core
KVA Rating Secondary No. of Tap Switch RWMA Model Number Weight Dwg. Frame Turns Ratio 440 Volt
110 C Rise Voltage Taps Location Pad Size 220V/60 Hz 440V/60 Hz Approx. No. Letter Tap 1 Tap 2 Tap 3 Tap 4 Tap 5
  1.9 to 3.5   End Mount 1 M22620AIBML M44620A1BML 148 R1308            
20 Volts 5             A 222:1 193:1 167:1 144:1 125:1
      5 Way Mount 1 M22620AIDML M44620A1DML 153 R1307            
                             
  2.7 to 5.2   End Mount 1 M22635B1BML M44635B1BML 187 R1308            
35 Volts 5             B 162:1 138:1 116:1 98:1 83:1
      5 Way Mount 1 M22635B1DML M44635D1BML 192 R1307            
                             
  3.5 to 6.5   End Mount 1 M22650J1BML M44650J1BML 230 R1308            
50 Volts 5             J 123:1 106:1 92:1 79:1 68:1
      5 Way Mount 1 M22650J1DML M44650J1DML 235 R1307            
                             
Standard Features: Optional Features:
* Class "F" insulation * Voltages and frequencies other than shown available on request
* Solderless lug connections for primary wiring * Thermostats
* Secondary pad sizes and hole spacings to RWMA * Special secondary pad sizes available on request
standard * Primary disconnect plug
* Secondary end positively sealed against
contimination