| PartNumber | 166M12 | 166M10 | 166M12B |
| Description | Power Transformers Open, Single Primary 117V 12.6CT 3A | Power Transformers RECT FIL | Power Transformers POWER TX 117VAC 12.6V@3A |
| Manufacturer | Hammond Manufacturing | Hammond Manufacturing | Hammond Manufacturing |
| Product Category | Power Transformers | Power Transformers | Power Transformers |
| Series | 166 | 166 | 166 |
| Type | Laminated Core | Laminated Core | Laminated Core |
| Termination Style | Wire Leads | Wire Leads | Wire Leads |
| Mounting Type | Chassis Mount | Chassis Mount | Chassis Mount |
| Size Dimension | 93.73mm L x 54.10mm W | 82.55mm L x 50.80mm W | - |
| Current Output Max | 3A | 3A | 3A |
| Power Max | 37.8 VA | 30 VA | 37.8 VA |
| Voltage Isolation | 2000Vrms | 2000Vrms | 2000Vrms |
| Height Seated Max | 58.67mm | 50.80mm | - |
| Voltage Primary | 115V | 115V | 117V |
| Voltage Secondary Full Load | 12.6V | 10V | 12.6V |
| Primary Winding s | Single | Single | Single |
| Secondary Winding s | Single | Single | Single |
| Center Tap | Yes | Yes | Yes |
| Product | - | Power Transformers | Power Transformers |
| Unit Weight | - | 1.400 lbs | 1.660 lbs |
| Mounting Style | - | Chassis | Chassis |
| Operating Temperature Range | - | 0 C to + 130 C | 0 C to + 130 C |
| Height | - | 42.9 mm | 2.31 in |
| Length | - | 82.6 mm | 3.69 in |
| Width | - | 41.4 mm | 2.13 in |
| Power Rating | - | 30 VA | - |
| Primary Voltage Rating | - | 115 VAC | 117 VAC |
| Secondary Voltage Rating | - | 10 VAC CT | 12.6 VAC |
| Secondary Current Rating | - | 3 A | 3 A |
| Primary Winding | - | Single Primary Winding | Single Primary Winding |
| Secondary Winding | - | Single Secondary Winding | Single Secondary Winding |
| Operating Frequency | - | 50 Hz 60 Hz | 50 Hz 60 Hz |