Technical Data · Publication 1497-TD001 · Rockwell Automation
Allen-Bradley Bulletin 1497 Control Circuit Transformers — Technical Data
Selection data, catalog-number breakdown, fuse sizing, dimensions, and regulation tables for the Allen-Bradley Bulletin 1497, 1497A, 1497B, and 1497D single-phase control circuit transformers. Mirrored from Rockwell Automation Publication 1497-TD001.
Download PDFDocument Preview
Open the full PDF in a new tab · Publication 1497-TD001
Specifications
Power & Voltage Ratings
| VA rating — 1497 Global | 63, 80, 130, 200, 250, 350, 500, 750, 800, 1000, 1600, 2000 VA |
|---|---|
| VA rating — 1497A Machine Tool | 50, 75, 100, 150, 200, 250, 300, 350, 500, 750, 1000, 1500, 2000, 3000 VA |
| VA rating — 1497B Control Power | 50, 75, 100, 150, 200, 250, 300, 500, 750, 1000, 1500, 2000, 3000 VA |
| VA rating — 1497D General Purpose | 0.050 – 25.0 kVA (50, 75, 100, 150, 250 VA; 3, 5, 7.5, 10, 15, 25 kVA) |
| Primary voltage options | 208V, 240V, 240×480V, 380V, 400V, 415V, 600V (60 Hz); 220V, 220×440V, 380V, 400V, 415V, 550V (50 Hz) |
| Secondary voltage options | 24V, 26V, 48V, 95V, 110V, 115V, 115×230V, 120V, 120×240V, 230V, 240V (50/60 Hz variants) |
| Construction | Single-phase; copper windings (≤2 kVA on 1497D; all 1497 core transformers); aluminum windings on 1497D ≥ 3 kVA; EN 60529 finger-safe on 1497 |
Thermal & Regulation
| Insulation class (1497) | Class 130 °C (55–80 °C temperature rise) |
|---|---|
| Insulation class (1497A) | 50–150 VA: Class 105 (55 °C rise); 200–1500 VA: Class 130 (80 °C rise); 2000–3000 VA: Class 180 (100 °C rise) |
| Insulation class (1497B / 1497D) | Class 180 °C (115 °C rise, 239 °F) |
| Regulation at 40 % PF inrush (example, 500 VA) | 85% sec. volts → 2,681 VA inrush; 90% → 2,221 VA; 95% → 1,648 VA |
| Power-factor adjustment | Divide by 0.64 (100 % PF), 0.67 (90 %), 0.71 (80 %), 0.78 (70 %), 0.82 (60 %), 1.00 (40 %), 1.11 (30 %), 1.29 (20 %), 1.50 (10 %) |
| Inrush duration | 30–50 ms typical; inrush current = 3–10 × steady-state (40 % PF assumed) |
Physical & Protection
| Mounting | Foot-mount steel frame; optional factory-installed or panel-mount primary/secondary fuse blocks (top-mount fuse blocks not available ≥ 750 VA) |
|---|---|
| Enclosure (1497D) | NEMA Type 3R, indoor/outdoor non-ventilated, resin encapsulated (exceeds UBC and California Title 24) |
| Fuse block options | 0 Primary / 0 Secondary, 0 Primary / 1 Secondary, 2 Primary / 0 Secondary, 2 Primary / 1 Secondary |
| Approximate shipping weight (1497B, 500 VA) | 18 lb (8.2 kg) |
| Approximate shipping weight (1497B, 2000 VA) | 61 lb (27.7 kg) |
| Finger-safe rating (1497) | EN 60529 compliant on primary and secondary terminals |
Catalog Number Format
How to read an Allen-Bradley 1497 catalog number. Each position encodes a specific configuration attribute.
Position
Meaning
Example
1497 / 1497A / 1497B / 1497D
Family prefix: 1497 = Global, 1497A = Machine Tool, 1497B = Control Power, 1497D = General Purpose 1-phase
1497B = Control Power
VA code (position a)
VA rating letter: 1497 uses A–M (63–2000 VA); 1497A/B/D use A1–A20 (50 VA – 25 kVA)
A = 63 VA (1497) / A5 = 200 VA (1497A)
Primary/secondary voltage code (position b)
Two- to four-character code: M1–M5 (1497 multi-tap), HX/AX/BA/CX/DX/JX/SX/JK/M4 (1497 single-primary), M6–M19 (1497A), M10–M24 (1497B/D)
BA = 240×480V (60 Hz) / 220×440V (50 Hz) primary
Fuse block code (position c)
0 = no fusing, 1 = 0 primary / 1 secondary, 2 = 2 primary / 0 secondary, 3 = 2 primary / 1 secondary
3 = 2 primary + 1 secondary fuse block
Factory-installed options (position d)
N = No Fusing / No Cover (and 'No Taps' on 1497A). Tap codes 2/22/4 (1497D only) add 5 % primary taps
N = no cover / no taps
Certifications & Compliance
cULus Listed (File No. E52057; Guide No. XPTQ, XPTQ7 for 1497 / 1497A / 1497B)
cULus Listed (File No. E311296; Guide No. XQNX for 1497D)
UL 5085-1 / UL 5085-2 (1497, 1497A, 1497B); UL 1561 (1497D)
CSA C22.2 No. 66.1 and No. 66.2 (1497, 1497A, 1497B); CSA C22.2 No. 47-M90 (1497D)
EN 61558 / CE Marked (1497 — note: 1497 at 500–800 VA with 500V primary does not carry the CE mark)
RoHS compliant (1497, 1497A, 1497B); Ecodesign Regulation (EU) 548/2014 (1497 Global)
Document Contents
Full PDF covers the following topics in detail:
- Family comparison chart — feature, output power, voltage, insulation class, and certification differences across 1497, 1497A, 1497B, and 1497D
- Complete catalog-number breakdown for multi-tap (M1–M5) and single-primary (HX/AX/BA/CX/DX/JX/SX/JK/M4) configurations
- Regulation and inrush-VA tables at 85 %, 90 %, and 95 % secondary voltage for every nominal VA rating from 50 VA to 3000 VA
- Power-factor adjustment multipliers from 10 % to 100 % PF
- Primary, secondary, and primary+secondary fuse sizing charts (NEC-compliant current-limiting fuse amperage) for every voltage × VA combination
- Approximate dimensions and shipping weights for every VA step
- Ecodesign (EU) 548/2014 data: core weight, conductor weight, full-load losses, no-load losses — per catalog number, for the global 1497 family
- Typical NEMA-size contactor inrush and sealed VA (Bulletin 500, 60 Hz, 120V, 3-pole) for transformer sizing
Frequently Asked Questions
How do I size a 1497 for my control circuit?
The selection process uses three inputs: total steady-state (sealed) VA, total inrush VA, and inrush load power factor. Assume 40 % PF when you don't have component-level data. Pick a transformer whose nominal VA rating, at the 85 %, 90 %, or 95 % secondary-voltage column (matching your supply-voltage stability), equals or exceeds your total inrush VA — while still accommodating the sealed VA as the continuous load. Regulation tables and the Bulletin 500 contactor reference table in Publication 1497-TD001 drive the math.
What's the difference between the 1497, 1497A, 1497B, and 1497D families?
1497 is the Global Control Circuit Transformer (63–2000 VA) with multi-tap primaries for worldwide voltages and EN 60529 finger-safe protection. 1497A is the epoxy-encapsulated Machine Tool Transformer (50–3000 VA) built for vibration and contamination on packaging/machine-tool panels. 1497B is the Control Power Transformer (50–3000 VA), epoxy-encapsulated, 60 Hz only. 1497D is the 1-phase General Purpose Transformer (0.05–25 kVA) in a NEMA Type 3R resin-encapsulated enclosure for indoor/outdoor power distribution to appliance, lighting, and motorized loads.
UL 5085 vs. UL 1561 — what standards apply?
The 1497, 1497A, and 1497B control transformers are Listed to UL 5085-1 / UL 5085-2 (Low Voltage Transformers), with CSA C22.2 No. 66.1/66.2 as the Canadian equivalent. The 1497D General Purpose line is Listed to UL 1561 (Dry-Type General Purpose and Power Transformers) with CSA C22.2 No. 47-M90. The 1497 Global family also carries EN 61558 for the European market and meets the Ecodesign Regulation (EU) 548/2014 efficiency minima.
Do I need primary fusing, secondary fusing, or both?
NEC Article 450 and Article 725 govern transformer overcurrent protection for control circuits. Publication 1497-TD001 provides three fuse-sizing charts: primary-only (Table 3/23), primary + secondary (Table 4/24), and secondary-only (Table 5/25). When only primary protection is used the allowed primary fuse is larger; when both are used, primary fusing is reduced because the secondary device provides overload protection. Factory-installed fuse blocks are available via catalog position c (codes 1, 2, 3) up to 500 VA top-mount.
What's inrush VA and why does it matter?
When a contactor, solenoid, or relay coil first energizes it draws 3–10 × its steady-state current for 30–50 ms. That burst is inrush VA. A transformer that's sized only for sealed VA will sag enough during inrush (the 85/90/95 % secondary-voltage columns in Table 1/7/17) that the coil fails to pull in. The 1497 selection process explicitly balances inrush VA against transformer regulation at the user's supply-voltage tolerance, which is why you use the inrush column — not the steady column — to pick the VA rating.
Can the 1497 run on either 50 Hz or 60 Hz?
Most 1497 Global and 1497A/B catalog numbers are dual 50/60 Hz rated. The catalog-number voltage code (M1/M2/M3 vs M4/M5 on the global family, and M6–M19 on 1497A) encodes whether the unit is 60 Hz-only, 50 Hz-only, or 50/60 Hz. The 1497B Control Power line is 60 Hz only. Confirm the frequency against the catalog number's b-position code before specifying.
Disclaimer
Disclaimer: PLC Exchange is an independent reseller and is not an authorized distributor, affiliate, licensee, partner, or agent of Allen-Bradley / Rockwell Automation. All product information on this page is compiled from publicly-available manufacturer publications, technical data sheets, and catalog sources, each of which remains the copyright of its originating manufacturer. We make no representation or warranty, express or implied, regarding the accuracy, completeness, timeliness, or fitness for any particular purpose of the specifications or descriptions shown — content may contain errors, omissions, or out-of-date information. Product images are the property of their respective manufacturers, trademark owners, and source publications, and are displayed solely for identification purposes under the nominative fair use doctrine; images are representative and may depict a different configuration or catalog variant than the exact product listed. Purchasers should independently verify specifications against the current manufacturer publication before placing an order. All product names, trademarks, service marks, and registered trademarks are the property of their respective owners, and their use does not imply endorsement or affiliation.