# GW Instek GCT-9040 40A AC Ground Bond Tester

# GW Instek GCT-9040 40A AC Ground Bond Tester

## Key Features At A Glance

-   40 A AC ground bond test current for production-line safety verification
-   Resistance measurement range from 1.0 mΩ to 650.0 mΩ with 0.1 mΩ resolution
-   240 x 64 ice blue dot-matrix LCD with function keys for rapid setup
-   PWM switching amplifier design for improved power efficiency and reliable testing
-   100 memory blocks for storing test condition setups
-   LINK interface for sequential or simultaneous testing with GPT-9800/9900/9900A safety testers
-   Front-panel remote terminal for external Start/Stop control
-   Standard USB and Signal I/O interfaces; GPIB available as an option

The GW Instek GCT-9040 is a 40 A AC ground bond tester designed to verify the integrity of the protective earth connection on electrical products. It delivers up to 40 A of AC test current and measures ground bond resistance from 1.0 mΩ to 650.0 mΩ, with a 240 x 64 ice blue dot-matrix LCD that displays test parameters and results, function keys for quick selection, and a high-intensity flash indicator for caution and status signaling.

According to the datasheet, the GCT-9040 supports safety testing of ground bond integrity on electrical products in manufacturing, quality assurance verification, safety standard compliance pre-qualification in R&D, and sequential or simultaneous test operation when paired with the GPT-9800 and GPT-9900 series safety testers. The instrument is positioned to replace the legacy GCT-630 and to augment the existing GW Instek safety tester product line.

## Brand Heritage

GW Instek is the trade name of Good Will Instrument Co., Ltd., a Taiwan-headquartered test and measurement manufacturer founded in 1975 with global subsidiaries serving China, Malaysia, Europe, the U.S., Japan, and Korea. The brand has remained under independent ownership throughout its history rather than being absorbed into a larger conglomerate, and continues to develop and produce its own safety tester, power supply, oscilloscope, and signal source product lines.

## Accessories Supplied

-   Quick Start Guide x 1
-   Power cord x 1
-   Test lead GTL-215 x 1
-   LINK cable GTL-132 x 1
-   USB cable GTL-247 x 1
-   Remote terminal male plug x 1
-   Interlock key x 1
-   CD x 1 (complete user manual)

## Product Core & Specifications

Category

Parameter

Specification

Ground Bond

Output-Current

03.00 A to 40.00 A ac

Output-Current Resolution

0.01 A

Output-Current Accuracy

3A ≤ I ≤ 8A : ±(1% of setting + 0.2A); 8A < I ≤ 40A : ±(1% of setting + 0.05A)

Test-Voltage

8 Vac max (open circuit)

Test-Voltage Frequency

50Hz/60Hz selectable

Resistance Measurement Range

1.0 mΩ ~ 650.0 mΩ

Resistance Measurement Resolution

0.1 mΩ

Resistance Measurement Accuracy

±(1% of reading + 2 mΩ)

Window Comparator Method

Yes

TIMER (Test Time)

0.5s ~ 999.9s

GND

OFF (fix)

Test Method

Four Terminal

Memory

Single Step Memory

MANU : 100 blocks

Interface

LINK

For system connection

USB

Standard

GPIB

Option

Remote Terminal (Front)

Standard

Signal I/O

Standard

Display

240 x 64 Ice Blue Dot matrix LCD

Power Source & Consumption

Source

AC 100 V / 120 V / 220 V / 230 V ±10%, 50/60Hz

Consumption

Max. 700 VA

Dimensions & Weight

330(W) x 148(H) x 460(D) mm; Approx. 17 kg max.

**Important:** Maximum test voltage at the output is 8 V AC (open circuit), with selectable 50/60 Hz test frequency.**Important:** Specifications subject to change without notice. (CT-9040GD1DH)**Important:** GPIB interface is an optional feature (Opt.1) and is not included as standard; order separately if remote GPIB control is required.**Important:** To perform sequential or simultaneous testing with other safety testers, GPT-9800/9900/9900A series safety testers are required and are not included with the GCT-9040.Recommended pairing: connect the GCT-9040 to a GW Instek GPT-9800, GPT-9900, or GPT-9900A series safety tester via the LINK interface (GTL-132 cable) to build a sequential or simultaneous safety test system as described in the datasheet's connection diagram.

**Please review the Manufacturer's Data Sheet to verify published specifications. Feedback on this webpage is always welcome — please reach out to your Test Architect at any time for questions or concerns. Thank you, we truly appreciate you being our customer.**

## Details

- **Price:** 1884.8 USD - 2241.05 USD
- **Vendor:** GW Instek
- **Type:** Hipot
- **Tags:** Hipot, Instek, Manufacturers, Other Equipment, product_manual_group_1, Product_new

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| None | 1884.80 USD | In stock |
| NIST Traceable | 2079.55 USD | In stock |
| NIST Traceable with Full Data | 2099.50 USD | In stock |
| ISO IEC 17025 Accredited | 2241.05 USD | In stock |

## Images

- GCT-9040 Instek HiPot

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> Source: [ValueTronics](https://value-tronics.myshopify.com/products/gct-9040-instek-hipot-new)
> Updated: 2026-06-02