Advanced Protection for Reliable Municipal Infrastructure
When to Install Standalone Earth Leakage Protection
Standalone earth leakage protection relays, such as the GA Series, are specifically required when an installed or specified motor protection relay (for example, NewElec’s LA Series or equivalent competitor models) lacks integrated on-board earth leakage or earth fault capabilities. In these configurations, adding a dedicated GA relay provides the necessary layer of fault detection without needing a complete relay system overhaul. By contrast, advanced comprehensive motor protection relays that already feature built-in earth leakage protection such as the Newcode relays implemented at Rand Water Zuikerbosch do not require an additional standalone earth leakage relay.
The GA Series Earth Leakage Relay is engineered for electrical systems where accurate earth leakage detection, earth fault protection and resistance to nuisance tripping are critical to reliable operation.
For municipal water and wastewater applications, the GA can provide a dedicated layer of protection across pump motors, MCCs and electrical distribution circuits serving water treatment plants, wastewater facilities, boreholes, booster stations and flood-control systems.
NewElec’s GA brochure identifies harmonic suppression, earth leakage protection, earth fault protection, instantaneous or IDMT operation and multiple sensitivity configurations as core GA Series features.
For full specifications, see the GA Earth Leakage Relay product page.
Why the GA Relay Was Designed
Motor-driven water infrastructure needs earth leakage protection that can distinguish genuine fault conditions while operating reliably in demanding electrical environments.
The GA Series was developed with harmonic suppression circuit characteristics, enabling sensitive earth leakage protection on high-kilowatt motors started direct-on-line as well as variable speed drive applications. Its configurable protection options allow engineers to match the relay more closely to the circuit and required protection philosophy.
The GA combines:
- Earth leakage protection
- Earth fault protection
- 30 mA to 1000 mA sensitivity options
- Instantaneous or IDMT trip-curve selection
- Harmonic suppression
- Fail-safe or non-fail-safe configuration
- Latching or non-latching main trip contacts
- 110/220 V AC or 380/525 V AC auxiliary supply options
- Dedicated contactor trip changeover contact
- Multiple Core Balance Current Transformer options
Municipal engineers can see how the relay fits into NewElec’s wider Municipal Motor Protection solutions.
Where the GA Fits Inside Municipal Water & Wastewater Operations
The GA Relay can provide dedicated earth leakage and earth fault protection across applications such as:
- Water treatment pumps operating across abstraction, treatment, transfer and distribution
- Wastewater and sewage pumps where submerged equipment and demanding conditions increase protection requirements
- Flood-control and dewatering pumps required to remain dependable during high-demand conditions
- Borehole and booster pumps with motor circuits and potentially long cable runs
- Municipal MCCs and distribution boards requiring dedicated earth leakage protection
- Power distribution motors and feeders supporting broader municipal infrastructure
These applications align directly with the systems addressed on NewElec’s Municipal Motor Protection Relay Solutions page, which includes water treatment, wastewater, dewatering, borehole, booster, HVAC, distribution and earth leakage applications.
Understanding the Problem: Common Earth Leakage Challenges in Municipal Systems
Municipal electrical and pumping systems can experience a combination of operating and environmental challenges, including:
- Deteriorating motor or cable insulation
- Moisture ingress and electrical leakage
- Earth faults within motors, cables or associated equipment
- Long operating periods on critical pumps
- Harmonic influences associated with drives and electronic equipment
- Nuisance trips that make fault diagnosis more difficult
- Ageing MCC and protection infrastructure
- Different protection requirements between DOL and VSD-driven motors
The GA focuses on the earth leakage and earth fault component of these risks. Where a pump also requires overload, dry-running, phase-loss or more comprehensive motor protection, it should form part of a wider protection architecture rather than being treated as the only relay required.
NewElec provides additional engineering guidance through its Motor Protection Knowledge Hub.
How the GA Relay Strengthens Municipal Electrical Protection
The GA Series Earth Leakage Relay is designed for manufacturing plants and industrial environments where electrical safety, equipment protection and operational reliability are essential. From conveyors and pumps to compressors, fans and other motor-driven machinery, the GA Series provides dependable earth leakage protection by detecting electrical leakage faults and initiating protective tripping, helping to minimise equipment damage, electrical hazards, unplanned downtime and costly maintenance.
Dedicated Earth Leakage Protection
Harmonic Suppression
Selectable Sensitivity
Instantaneous or IDMT Protection
Configurable Trip Behaviour
Flexible CBCT Selection and Suitable for New and Retrofit Applications
Application Examples
Water Treatment Pumps
Dedicated earth leakage protection for critical pump circuits operating throughout municipal water treatment and distribution processes.
NewElec’s wider Water Treatment Pump Protection solutions can be used where additional dry-run, overload or pump-specific protection is required.
Wastewater & Sewage Pumps
Earth leakage and earth fault protection for motor circuits operating in demanding wastewater and sewage environments.
Borehole & Booster Pumps
Protection of pump circuits where submerged motors, extended cabling and continuous operating requirements can make electrical fault detection particularly important.
Municipal MCCs & Distribution
Dedicated earth leakage protection within motor starters, MCCs and distribution systems supporting broader municipal infrastructure.
For feeder-level applications beyond the GA’s core earth leakage function, see NewElec’s Electrical Distribution Industry solutions.
GA Series Earth Leakage Protection for Municipal Pump Reliability
Reliable municipal pumping systems depend on effective electrical protection. Earth leakage and insulation faults can cause unexpected shutdowns, equipment damage and costly maintenance across water treatment plants, wastewater facilities and borehole pumping stations.
NewElec’s GA Series Earth Leakage Relay provides sensitive earth fault detection and reliable tripping to help protect electrical equipment, minimise downtime and support safer municipal operations.
Key Protection Considerations
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Earth Leakage Detection: Identifying electrical leakage and earth faults.
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Adjustable Sensitivity: Matching protection settings to application requirements.
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Trip Characteristics: Instantaneous and IDMT protection options.
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Harmonic Suppression: Reducing unwanted trips caused by electrical disturbances.
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Equipment Reliability: Protecting critical pumping systems against electrical faults.
For more information, explore NewElec’s Municipal Motor Protection Solutions.
Models & Expansion Options
GA Standard
Dedicated earth leakage and earth fault protection for motors and electrical circuits.
Sensitivity Ranges
- GA 30: 30 mA
- GA 250: 250 mA
- GA 375: 375 mA
- GA 500: 500 mA
- GA 1000: 1000 mA
The brochure specifies ±10% calibration for the GA 30 and ±5% for the 250 mA to 1000 mA models.
Trip Configuration
Select between:
Instantaneous protection
Minimum specified operating time: 0.150 seconds
or
IDMT protection
Standard inverse characteristic with a 0.1 time multiplier.
Contact Configuration
Available configurations include:
- Fail-safe or non-fail-safe
- Latching or non-latching
- Latched contactor-trip changeover contact
Auxiliary Supply
Available for:
- 110/220 V AC
- 380/525 V AC
with a specified operating tolerance of 85–120% of range.
Core Balance CT Options
The current GA product range supports CBCT apertures from 43 mm through to 400 mm rectangular options, allowing different conductor arrangements to be accommodated.
Review current ordering information and product codes on the GA product page.
Protection Outcomes for Municipal Applications
Faster identification and isolation of earth leakage conditions
Protection settings matched more closely to the individual circuit
Instantaneous or IDMT operation for different coordination requirements
Harmonic suppression designed to reduce nuisance-operation challenges
Multiple CBCT sizes for different motor and feeder arrangements
Retrofit potential for selected existing MCC and protection systems
Local technical and product support from NewElec
For municipalities considering gradual upgrades to existing infrastructure, these protection improvements can also sit within NewElec's Why Wait to Automate™ modernisation approach.
Testimonial/Case Study
FAQ
What makes the GA different from a standard earth leakage relay?
The GA combines dedicated earth leakage and earth fault protection with multiple sensitivity options, instantaneous or IDMT operation and harmonic suppression characteristics.
See the GA Series product page for full specifications.
Can the GA Relay be used in municipal water treatment plants?
Yes. Water and wastewater facilities are identified applications for the GA, and earth leakage protection forms part of NewElec’s wider municipal protection approach.
Can the GA protect sewage and wastewater pump motors?
The GA can provide the dedicated earth leakage and earth fault protection component of the circuit. Other motor protection functions may require an additional or alternative relay.
Does the GA protect against dry running and motor overload?
The GA’s documented core functions are earth leakage and earth fault protection. For dry running, overload, phase loss and other pump protection requirements, review NewElec’s wider motor protection relay range.
How do I know which GA configuration to select?
Selection should consider required earth leakage sensitivity, motor and starter type, harmonic environment, cable arrangement, trip behaviour, auxiliary supply and the wider protection requirements of the circuit.
NewElec’s technical Knowledge Hub and engineering team can assist with application-specific selection.
Download Our Technical Guide
Please complete the form below to gin access and download the Technical Guide PDF.
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