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Series-APT
Isolated AC Transformers, 20-150 VA, 24 VAC, HVAC/Bldg Automation, UL Class 2
Transformadores de CA aislados, 20-150 VA, 24 Vca, HVca/Automatización de Edificios, Clase 2 UL
Models In Stock
- Single or dual 1/2" NPT
- Universal supply voltage input
- With or without integral circuit breaker
Series-APT
From
Models In Stock
Product Overview
- Applications HVAC
- Electrical Connection Pigtail Leads
- Frequency Input Range 50/60 Hz
- Series ID Series-APT
- Voltage Output Range 24 Vac
- Wire Gauge 18 AWG
Supported Applications
The Dwyer Series APT AC Power Transformers provide isolated step-down to 24 VAC for building automation and control panel applications in HVAC. These cost-efficient transformers are designed to meet installation requirements where a stable, low-voltage power source is needed from standard line voltages.
Operating Conditions & Performance
The series delivers an output voltage of 24 VAC with input frequency support for 50/60 Hz. Output VA ratings are available in discrete steps: 20, 40, 50, 75, 96, or 150 VA. Input voltages vary by model configuration and include single-phase options of 24 VAC, 120 VAC, and 240 VAC, as well as multi-tap configurations supporting 120/208/240/277 VAC or the extended range of 120/208/240/277/480 VAC. All models are UL Class 2 listed and carry CE and cULus compliance marks.
Physical Dimensions
Overall dimensions vary by VA rating and mounting configuration, with the following ranges documented across the series:
- A (Width): 1-31/64 [37.6] to 2-33/64 [64.0] in [mm]
- B (Depth): 1-21/32 [41.9] to 1-31/32 [50.2] in [mm]
- C (Height): 1-7/8 [47.5] to 2-1/2 [63.5] in [mm]
- D: 2-17/64 [57.4] to 3-9/16 [90.5] in [mm]
- E: 2-39/64 [66.2] to 3-1/32 [77.0] in [mm]
Configuration Options
The Series APT offers configurable options for mounting, electrical connections, and current protection tailored to specific panel layouts.
Mounting & Hubs
- Foot Mount: Slotted foot mount with either a single or dual 1/2" NPT hub.
- Dual Hub Models: Available for higher VA ratings and specific input configurations (e.g., models ending in -DB).
Electrical Connections & Leads
- Standard Lead Length: 8.5" (210 mm) 18 AWG leads for most models.
- Extended Lead Option: Models ending in -20 feature 20" (508 mm) 18 AWG leads.
Current Protection & Wiring Diagrams
- Inherent Protection: Standard on models with "N" suffixes in the hub type segment.
- Button Circuit Breaker: Available on select 50 VA, 75 VA, and higher-rated models (indicated by "B" in model code).
- Wiring Configurations: Models reference Diagram A, B, C, or D for connection details based on input voltage requirements.
Key Product Differences
Variants within the Series APT are distinguished by their VA rating, input voltage compatibility, hub configuration (single vs. dual), and current protection method. The model number structure follows the pattern APT-. For example, a 50 VA transformer with a dual hub, button circuit breaker, and wiring diagram C is designated APT-50-5DB.
Dual-hub models (suffix -D) are typically paired with higher input voltage ranges or specific protection requirements compared to single-hub variants. The series includes both 96 VA and 100 VA ratings in the model chart, reflecting distinct capacity options within that range bracket.
PDFs & Manuals
