Powervolt Group GP Standard A00 Series: Everything You Need to Know

Part of the Powervolt Group Industrial Control Transformers knowledge hub

This article covers the GP Standard A00 Series in depth. For a complete overview of all three Powervolt control transformer series, VA sizing methodology, installation guidance, and certifications, see the full pillar guide.

Back to: Industrial Control Transformers – Complete Guide

The GP Standard A00 Series is Powervolt Group’s flagship line of industrial control transformers for 220–480 V environments.

The series spans 14 VA ratings – from the compact 25 VA GP0025-A00 used in indicator panels, up to the 2000 VA GP2000-A00 for high-load plant infrastructure – all UL/cUL 5085-2 Listed (File E47299), CE marked, RoHS and REACH compliant, and backed by Powervolt Group’s 10-year warranty. Every unit is manufactured and 100% tested in Addison, Illinois, USA.

Browse & Check Price – All A00 Models In Stock

All 14 GP Standard A00 models are stocked at Powervolt Group’s Addison, Illinois facility. Check live pricing, datasheets, and availability for each part number.

→ Browse GP Standard A00 Series on powervoltgroup.com →

Powervolt Group: 1-888-797-8658 (Toll Free) | (630) 628-9999 | [email protected]

What Defines the A00 Series

The A00 designation identifies GP Standard transformers wound for a 220/440, 230/460, or 240/480 V single primary 110, 115, or 120 V secondary – the dominant voltage pairing in North American industrial control. All 14 models share the same electrical platform:

Dual-wound, fully isolated primary-to-secondary – eliminates common-mode noise on sensitive control circuits
Class B (130 °C) insulation standard – suitable for standard panel environments up to 40 °C ambient
High inrush withstand – secondary voltage held at ≥ 85% rated during inrush (see regulation data table in Section 3)
UL/cUL 5085-2 Listed, UL File E47299 – North American compliance out of the box
CE marked, RoHS compliant, REACH compliant – ready for international and European projects
Exceeds NEMA ST-1, ANSI, NMBTA, JIC, and IEC standards
IEC touch-proof (finger-safe) terminal blocks – safe, code-compliant panel wiring
Copper coils for excellent thermal characteristics
Heavy-gauge steel mounting plate with 4 mounting slots – fits standard panel-mount configurations
Optional fuse blocks (CC-class or slow-blow) – fuse block kits available for easy field installation
50/60 Hz dual-rated – North American and international supply frequencies
10-year warranty – backed by Powervolt Group, Addison, Illinois, USA

Need a different voltage pairing – 600 V primary, 240 V secondary, or 575 V supply? See the Industrial Control Transformers pillar guide for Powervolt Group’s full three-series comparison: GP Standard, GP Econoline, and GP Enclosed.

A00 vs GP Econoline – When to Choose Which

The GP Econoline Series offers a lower initial cost but is only available in 300–1500 VA and uses Class F (155 °C) insulation only.

For machinery with frequent start-stop cycles, VA ratings below 300 VA, or applications requiring Class B insulation, specify the GP Standard A00 Series.

The A00 Series uses heavier copper windings and a higher-grade core for superior inrush performance and longer service life.

Browse GP Econoline Series | Browse GP Enclosed Series (NEMA 1/4/4X)

All 14 A00 Models at a Glance

Click any part number to go directly to its live product page on powervoltgroup.com for datasheet download, pricing, and stock status. All models carry UL File E47299 and are RoHS and REACH compliant.

VA	Part No.	Primary	Typical Load	Application
25 VA	GP0025-A00	220/440, 230/460, 240/480 V	Pilot lights, small control loads	Indicator panels, annunciators
50 VA	GP0050-A00	220/440, 230/460, 240/480 V	Single contactor + pilot lights	Simple motor starters
75 VA	GP0075-A00	220/440, 230/460, 240/480 V	Multi-contactor, light duty	Light-duty starter panels
100 VA	GP0100-A00	220/440, 230/460, 240/480 V	PLC + I/O modules	Programmable control panels
150 VA	GP0150-A00	220/440, 230/460, 240/480 V	Multi-relay + HMI displays	Mid-complexity automation
200 VA	GP0200-A00	220/440, 230/460, 240/480 V	Motor starters, panel boards	Combination starter panels
250 VA	GP0250-A00	220/440, 230/460, 240/480 V	Multiple solenoids + relays	VFD + PLC + I/O panels
300 VA	GP0300-A00	220/440, 230/460, 240/480 V	Large panel boards	Multi-axis control panels
350 VA	GP0350-A00	220/440, 230/460, 240/480 V	Heavy relay logic panels	Complex relay logic systems
500 VA	GP0500-A00	220/440, 230/460, 240/480 V	Machine tool control circuits	CNC and machining centres
750 VA	GP0750-A00	220/440, 230/460, 240/480 V	Automation systems, conveyors	Full MCC bucket applications
1000 VA	GP1000-A00	220/440, 230/460, 240/480 V	Large machine control panels	SCADA + dual PLC systems
1500 VA	GP1500-A00	220/440, 230/460, 240/480 V	Heavy industrial automation	Robot cells, stamping lines
2000 VA	GP2000-A00	220/440, 230/460, 240/480 V	High-load plant infrastructure	Central automation rooms

Shared Specifications – All 14 A00 Models

Specification	Value
Primary voltage	220/440, 230/460, 240/480 V AC (series parallel terminal block)
Secondary voltage	110, 115, 120 V AC
Frequency	50/60 Hz dual-rated
Insulation class	Class B (130 °C)
Inrush withstand	See Powervolt regulation data table in Section 3 — ≥ 85% secondary voltage at rated inrush
Certifications	UL/cUL 5085-2 Listed (File E47299), CE marked, RoHS, REACH
Standards met	Exceeds NEMA ST-1, ANSI, NMBTA, JIC, IEC
Construction	Open-frame, copper windings, silicon-steel laminated core
Terminals	IEC touch-proof (finger-safe) terminal blocks
Fuse options	Optional CC-class or slow-blow fuse blocks; fuse block kits available
Ambient temp.	−20 °C to +40 °C operating; derate above 40 °C per Powervolt thermal curve
Enclosure	None — mount inside a NEMA-rated control panel
Warranty	10 years — Powervolt Group Inc., Addison, Illinois, USA
Made in	USA — 100% manufactured and tested in Addison, Illinois

How to Size an A00 Transformer for Your Panel

The full sizing methodology – including Powervolt’s regulation data table – is in Section 4 of the Industrial Control Transformers pillar guide. The summary below applies those steps to 480 V A00 applications.

Step 1 – List Every 120 V Load on the Secondary

Identify every device the transformer must power simultaneously: contactor coils, relay coils, PLC power supply, I/O modules, solenoid valves, HMI panels, pilot lights, and timers. Record both steady-state (sealed) VA and inrush VA for each device from the manufacturer’s datasheet.

Step 2 – Calculate Worst-Case Simultaneous Inrush

Identify the start-up sequence where the most coils energise at once. Use Powervolt’s Method A: sum the sealed VA of all loads + sum the inrush VA of all simultaneously energising loads.

(Method B produces a slightly oversized result, which is the safer default for sizing.) Electromagnetic devices – contactors, relays, solenoids – typically energise in 20–50 ms and draw 3–10× their sealed current during that period.

Step 3 – Cross-Check Against Powervolt’s Regulation Data Table

Locate your calculated inrush VA in the table below (at 85% secondary voltage, 40% power factor — the worst-case column). Select the next standard A00 rating whose inrush VA figure is greater than or equal to your calculated value.

A00 VA Rating	Max Inrush VA @ 85% Secondary, 40% PF
25 VA	160 VA
50 VA	270 VA
75 VA	435 VA
100 VA	655 VA
150 VA	1,300 VA
200 VA	1,975 VA
250 VA	2,680 VA
300 VA	3,180 VA
350 VA	3,665 VA
500 VA	6,300 VA
750 VA	10,555 VA
1000 VA	15,225 VA

Source: Powervolt Group GP Standard Series regulation data table. Full 90% and 95% columns available in the online catalogue.

Size to Inrush – Not Steady-State

The most common selection error is calculating only the steady-state load. A 100 VA transformer sized to a 100 VA continuous load will sag below 85% secondary voltage when three contactors energise simultaneously at start-up. Always base the VA selection on the inrush budget using Powervolt’s regulation data table above.

Not Sure Which VA Rating Fits Your Panel?

Powervolt Group’s engineering team provides free sizing assistance. Share your load list and we’ll specify the right A00 model – or recommend a custom configuration if needed.

→ Contact Powervolt Group Engineering →

Individual Model Pages – All 14 A00 Part Numbers

Each part-number page on powervoltgroup.com includes the full datasheet (PDF), dimensional drawings, inrush derating curves, and live pricing. All pages link back here and to the GP Standard Series catalogue page.

Low-Power Range – 25 to 150 VA

Best for indicator panels, annunciators, simple motor starters, single-PLC installations, and HMI stations.

GP0025-A00 – 25 VA Pilot lights, small control loads – indicator panels, annunciators
GP0050-A00 – 50 VA Single contactor + pilot lights – simple motor starters
GP0075-A00 – 75 VA Multi-contactor light duty – light-duty starter panels
GP0100-A00 – 100 VA PLC + I/O modules – programmable control panels
GP0150-A00 – 150 VA Multi-relay + HMI displays – mid-complexity automation

Mid-Power Range – 200 to 500 VA

Suited to combination starter panels, VFD + PLC enclosures, multi-axis machines, and CNC machining centres.

GP0200-A00 – 200 VA Motor starters, panel boards – combination starter panels
GP0250-A00 – 250 VA Multiple solenoids + relays – VFD + PLC + I/O panels
GP0300-A00 – 300 VA Large panel boards – multi-axis control panels
GP0350-A00 – 350 VA Heavy relay logic panels – complex relay logic systems
GP0500-A00 – 500 VA Machine tool control circuits – CNC and machining centres

High-Power Range – 750 to 2000 VA

For full MCC buckets, SCADA panels, robot cells, stamping lines, and central automation rooms.

GP0750-A00 – 750 VA Automation systems, conveyors – full MCC bucket applications
GP1000-A00 – 1000 VA Large machine control panels – SCADA + dual PLC systems
GP1500-A00 – 1500 VA Heavy industrial automation – robot cells, stamping lines
GP2000-A00 – 2000 VA High-load plant infrastructure – central automation rooms

A00 Series Installation Quick Reference

These are the key steps for installing an A00 model. Full installation guidance – NEC code references, grounding requirements, ventilation, and troubleshooting – is in Sections 6 and 7 of the Industrial Control Transformers pillar guide.

Mount on a horizontal surface using the provided heavy-gauge steel mounting plate (4 mounting slots)
Connect the primary tap terminal matching your supply – 220/440, 230/460, or 240/480 V – to the multi-tap primary terminal block
Install slow-blow (time-delay) primary fuses at 200% of rated primary current; optional Powervolt fuse block kits simplify installation
Ground the X1 (neutral) terminal to the panel ground bus per NEC 250.186
Install secondary control-circuit fuses or a breaker at 200% of rated secondary current per NEC Articles 430 and 725
Allow a minimum 25 mm clearance on all sides for natural convection cooling

For the complete wiring guide, grounding options, and first-energisation safety check, see Sections 6 and 7 of the Industrial Control Transformers pillar guide.

Order the GP Standard A00 Series from Powervolt Group

All 14 A00 models are stocked at 300 W Factory Road, Addison, IL 60101 with 1 Week standard shipment. OEM pricing contracts and volume discount programmes are available. International orders welcome.

Request a Quote – Same-Day Response

Powervolt Group responds to all quote requests within one business day. Submit your part number, quantity, and delivery requirement and our sales team will provide OEM pricing and lead time.

→ Request a Quote from Powervolt Group →

GP Standard A00 Series – FAQ

Is the A00 Series suitable for 50 Hz supplies?

When a transformer designed for 60 Hz operation is used on a 50 Hz supply at the same voltage, the magnetic core actually experiences a slight increase in core flux density (not a decrease), because flux is inversely proportional to frequency.

In well-designed transformers such as the GP Standard A00 Series, this increase remains within acceptable design limits, so no derating is required. However, operation at 50 Hz can result in marginally higher magnetizing current, increased reactive power demand, and slightly greater voltage drop due to higher leakage reactance effects. These impacts are generally minor and are already considered in Powervolt’s dual-frequency design margins.

What is the correct primary tap to use for a 480 V supply?

Connect to the 240/480 V tap pair on the multi-tap primary terminal block. The A00 Group also accommodates 220/440 V and 230/460 V supplies — connect to the corresponding tap pair for your available line voltage.

Can I parallel two Standard transformers for a higher VA rating?

Not recommended. Impedance mismatches between units cause unequal current sharing and can overload the lower-impedance unit. Select the next higher standard VA rating from the A00 table instead. If your load exceeds 2000 VA, contact Powervolt Group for a custom solution.

Why choose A00 over the GP Econoline Series?

The GP Standard A00 Series covers 25–2000 VA and offers a bigger core size with Class B (130 °C) insulation — necessary for high-ambient panels and for the smallest VA sizes. The GP Econoline Series covers only 300–1500 VA and uses Class F (155 °C) insulation only. For frequent start-stop duty, or any panel requiring a VA rating below 300 VA, the A00 Series is the correct specification. See the full three-series comparison in the pillar guide.

Is an enclosed (NEMA-rated) version available?

Yes – Powervolt Group’s GP Enclosed Series is available in NEMA 3R ratings for installations outside an existing enclosure, in washdown areas, or in dusty environments. Primary: 208–600 V. Secondary: 120/240 V. VA range: 250–2000 VA.

Where can I download the GP0025-A00 datasheet?

Each part-number page on powervoltgroup.com includes a direct PDF datasheet download. Go to powervoltgroup.com/part-details/GP0025-A00 and click “View” in the Datasheet column. Datasheets for all 14 A00 models are available on their individual part-detail pages.