The BF5F is a Class 2 energy limiting transformer on a box mount plate, stepping 240V AC down to a 16V AC secondary at a 75 VA power rating. It is intended for electricians, installers and OEM builders powering low-voltage loads such as chimes, door bells, security systems, decorative lighting, furnaces, humidifiers, appliances, vending machines and intercom systems.
A 16 V secondary is a common choice for chimes and door bells, and at 75 VA this unit can supply up to 4.68 A. The design is described as rugged and low noise, and it is for indoor use only. The primary side uses stripped wire leads and the secondary uses screw terminals, so the low-voltage output wiring can be landed without splices.
The transformer is mounted on a box plate for easy installation. Input leads are black, 6 in minimum, and on this 240V model the 240V lead is red for easy identification during wiring. The unit is designed for 50/60 Hz operation, with output limited by a built-in circuit breaker. Overall dimensions are 3.00 in (76 mm) A x 2.50 in (64 mm) B x 3.75 in (95 mm) C, and the shipping weight is 3.37 lbs (1.53 kg).
On compliance, the BF5F is c UL us listed under file E184371 as Class 2 (not inherently limited) and CSA certified (209651). It is also REACH and RoHS compliant.
| Series | BF Series - Class 2 Energy Limiting Box Mount |
| Product Type | Transformer, Class 2 energy limiting, box mount |
| Short Description | CLASS 2 TX 75VA 240V |
| Overall Dimension A | 3.00 in (76 mm) |
| Overall Dimension B | 2.50 in (64 mm) |
| Overall Dimension C | 3.75 in (95 mm) |
| Frequency | 50/60 Hz |
| Protection | Limited by built-in circuit breaker |
| Power Rating | 75 VA |
| Output Current | 4.68 A (RMS) |
| Primary Termination | Stripped wire input leads, black, 6 in minimum; 240V lead is red |
| Primary (Input) Voltage | 240 VAC (RMS) |
| Secondary (Output) Voltage | 16 VAC (RMS) |
| UPC | 623980108858 |
| UNSPSC | 39121301 |
| Part Number | BF5F |
| Shipping Weight | 3.37 lbs (1.53 kg) |
| Design | Rugged, low noise |
| Mounting | Mounted on box plate |
| Environment | Indoor use only |
| UL | c UL us listed #E184371 - Class 2 Not inherently limited |
| CSA | CSA certified (209651) |
| RoHS Compliant | Yes |
| REACH Compliant | Yes |
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It takes 240V AC (RMS) on the primary and delivers 16V AC (RMS) on the secondary, with a 75 VA rating and 4.68 A output current.
No. It is c UL us listed #E184371 as Class 2, not inherently limited; output is limited by a built-in circuit breaker.
The primary uses stripped wire leads (black, 6 in minimum, with the 240V lead in red) and the secondary uses screw terminals.
No. The BF Series is for indoor use only.
Yes. All BF models are designed for 50/60 Hz operation.
Yes. The BF Series includes the BF2F, which has a 120V primary and the same 16V, 75 VA output.
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