24VAC Center-Tapped Step-Down Transformer, 117VAC, 5A | PX-24C5
Part PX-24C5 is an open-frame, laminated-core chassis-mount step-down transformer featuring a 117VAC, 60Hz primary and a 24VAC center-tapped secondary rated at 5A. It delivers 24VAC end-to-end or 12VAC between either secondary end and the center tap.
Designed for qualified electricians, electronics technicians, repair teams, and experienced builders integrating a component transformer into a properly designed and protected assembly.
Installation and Output Notice: This component requires mains-voltage wiring. It is not a plug-in adapter and does not produce DC. Disconnect mains power before installation or servicing. Use qualified installation with an appropriate enclosure, circuit protection, secure mounting, and insulated connections in accordance with equipment requirements and applicable electrical codes.
Technical Specifications
- Part: PX-24C5
- Construction: Open-frame, laminated-core chassis-mount transformer
- Primary Input: 117VAC, 60Hz
- Secondary Output: 24VAC center-tapped, labeled 0-12V-24VAC
- End-to-End Secondary Voltage: 24VAC
- Either Secondary End to Center Tap: 12VAC
- Rated Secondary Current: 5A (5000mA)
- Connections: Wire leads
- Mounting: Chassis mounting tabs with mounting holes
- Listed Frame Specification: EI-96 × 40mm; this is not a verified mounting-hole spacing.
- Listed Dimensions: 96 × 80 × 82mm (L × W × H); confirm actual dimensions and mounting-hole spacing before specifying physical fit.
Understanding the Center-Tapped Output
The center tap divides one secondary winding into two 12VAC sections. Use the two secondary end leads for 24VAC, or one secondary end and the center tap for 12VAC. Identify leads from verified wiring documentation; do not assume functions from wire color alone.
The two halves are not independent 5A power supplies. The center tap does not double the current rating. A 5A AC rating does not guarantee 5A of usable DC after rectification. Confirm allowable loading for the intended circuit.
Use Cases for Repair and Electronics Projects
- Equipment Repair: A candidate replacement only where primary ratings, secondary voltage, current, center-tap configuration, mechanical fit, and protection requirements match.
- Electronics Prototyping: Assemblies designed around a 24VAC center-tapped or 12VAC half-winding source.
- Custom Linear Power-Supply Projects: Designs using separately selected rectification, filtering, and regulation components.
Replacement and Purchasing Checklist
Before ordering Part PX-24C5, verify input voltage and frequency, AC rather than DC output, load current, winding configuration, clearance, mounting-hole spacing, lead identification, and required safety approvals. This is not a universal replacement for audio, HVAC, or control equipment. Compatibility must be established for the specific assembly.
Frequently Asked Questions
Does Part PX-24C5 output AC or DC?
It outputs AC, not DC. DC applications require a separately designed rectifier, filter, and any necessary regulation.
What does 24VAC center-tapped mean?
The complete secondary winding provides 24VAC between its end leads. Each half provides 12VAC between one end and the center tap.
Can I use it for 12VAC?
A 12VAC half-winding is available. Confirm lead identification and allowable loading before connection; the center tap does not increase current capacity.
Is this a plug-in power adapter?
No. It is an open-frame component requiring mains wiring, chassis mounting, enclosure, and appropriate protection.
Will it replace my existing transformer?
Only when electrical ratings, winding configuration, mechanical fit, wiring, and required approvals match. Output voltage alone does not establish compatibility.
