Littelfuse SE-601-0T - SE-601-0T is a sensitive ground-fault monitor with a supply voltage dc of 40–55.
Littelfuse

SE-601-0T

Alternate Item Number: SE-601-0T

UPC: 079458989021

Documents & Media
BrochureTechnical BulletinSpecification SheetUser Manual

Contact for Pricing

Overview

The Littelfuse SE-601-0T is a high-performance, microprocessor-based sensitive ground-fault monitor engineered for ungrounded DC systems operating at 40–55 VDC. Designed to deliver precise, reliable ground-fault detection without nuisance tripping, this advanced relay is a critical component for protecting sensitive electrical infrastructure in industrial, commercial, and utility applications. Unlike conventional ground-fault protection devices that may compromise between sensitivity and stability, the SE-601-0T leverages Littelfuse’s proven technology to provide early fault detection while minimizing false alarms—a common challenge in ungrounded DC systems where even minor insulation degradation can lead to catastrophic failures. At the core of the SE-601-0T’s functionality is its integration with the SE-GRM Series Ground-Reference Module, which limits ground-fault current to just 25 mA. This ensures safe, controlled operation even in high-voltage environments such as solar power systems, transportation electrification, and industrial control circuits. The monitor supports adjustable trip levels from 1 to 20 mA and trip time settings ranging from 50 ms to 2.5 seconds, offering unparalleled flexibility to tailor protection to specific system requirements. Whether deployed in a 24 VDC control panel or a 1000 VDC solar array, the SE-601-0T delivers consistent performance across a broad spectrum of DC applications. Professionals in power distribution, renewable energy, and critical infrastructure sectors rely on the SE-601-0T for its robust design and compliance with stringent safety standards. The device is CSA certified, UL Listed (E340889), CE marked, and C-Tick approved, ensuring global regulatory acceptance. Its isolated Form A and Form B output contacts support both fail-safe and non-fail-safe operating modes, enabling seamless integration with shunt or undervoltage breaker coils. Additionally, the SE-601-0T features a 0–5 V analog output for connection to monitoring systems or optional panel-mounted meters like the PGA-0500, which displays ground-fault current as a percentage of 22 mA. Installation is straightforward, with options for DIN rail, surface, or panel mounting (using the PMA-55 or PMA-60 adapter). The non-volatile trip memory retains fault state even when de-energized, simplifying troubleshooting and reducing downtime. With no calibration required, maintenance costs are minimized, and reliability is maximized. Backed by Littelfuse’s five-year warranty and distributed by trusted partners like Gross Automation, the SE-601-0T represents a cost-effective, future-proof solution for ground-fault protection in ungrounded DC systems. Whether safeguarding mission-critical control circuits or enhancing the safety of large-scale solar installations, this monitor delivers the precision, durability, and compliance that engineers demand.
  • Microprocessor-based ground-fault relay for ungrounded DC systems (40–55 VDC)
  • Adjustable trip levels: 1–20 mA with selectable trip delays (50 ms–2.5 s)
  • Integrates with SE-GRM Ground-Reference Module (25 mA fault current limit)
  • Isolated Form A/Form B contacts with fail-safe/non-fail-safe modes
  • 0–5 V analog output for monitoring or control system integration

Specifications

Application
Industrial
Brand Name
Littelfuse
Connection Type
Screw Terminal / Wiring
Current Rating
1-20 mA
Mounting Type
DIN rail, surface, or panel mounting
Poles
Form A and Form B contacts
Series
SE-GRM Series
Special Features
Analog output for external metering
Sub Brand
SE 601 Series
Type
Ground Fault Relays
Voltage Rating
40-55 VDC
Package Weight (Imperial)
1.100 L
Package Weight (Metric)
0.500 kg
RTXD Extractor Tool

6896057-1

RTXD Extractor Tool
RTXP 18

RK926011-BC

RTXP 18
Relay Accessories, Sockets & Clips, Printed Circuit Board, Phenolic, Printed Circuit Board, 6, Socket, Potter & Brumfield R10

1-1393143-3

Relay Accessories, Sockets & Clips, Printed Circuit Board, Phenolic, Printed Circuit Board, 6, Socket, Potter & Brumfield R10
Relay Accessories, Sockets & Clips, Solder, Polyester, Printed Circuit Board, 2, Socket, Potter & Brumfield R10

1-1393143-6

Relay Accessories, Sockets & Clips, Solder, Polyester, Printed Circuit Board, 2, Socket, Potter & Brumfield R10
Power supply for DIN-rail

PS-60

Power supply for DIN-rail
IP67 SCP-X Extreme Environment Series Power Supply. Double Stacked, Output Power 2 x 100W, Output Voltage 24 Vdc, Output Current 7.6 A total, 3.8 A per pair

SCP102D24X-C02

IP67 SCP-X Extreme Environment Series Power Supply. Double Stacked, Output Power 2 x 100W, Output Voltage 24 Vdc, Output Current 7.6 A total, 3.8 A per pair

Frequently Asked Questions about Littelfuse

What certifications and standards do Littelfuse products comply with?

Littelfuse products are certified to multiple international standards, including UL (Underwriters Laboratories), CSA (Canadian Standards Association), CCC (China Compulsory Certification), and EAC (Eurasian Conformity). Customers can verify specific product certifications by consulting individual product datasheets on Littelfuse.com, which provide comprehensive details about standards compliance for each component.

What industries and applications are Littelfuse products used for?

Littelfuse products are critical for electrical protection and safety across multiple industrial sectors, including manufacturing, automation, power distribution, and electrical control systems. Their comprehensive product portfolio serves industries that require robust electrical protection, including motor and pump applications, solar installations, programmable logic controllers (PLCs), electrical switch panels, and critical infrastructure environments. Key product lines protect against overcurrent, voltage transients, ground faults, and temperature-related electrical risks, ensuring equipment safety and operational reliability.

What technical support does Littelfuse offer?

Littelfuse offers comprehensive technical support through multiple channels. Their Technical Hotline (800-TEC-FUSE) provides direct access to engineers who can help identify issues and recommend solutions. Additionally, Littelfuse offers extensive online Technical Resources at Littelfuse.com, including datasheets, product manuals, whitepapers, application guides, and online design tools. Their experienced product and application engineers also provide step-by-step support from design to installation.

What are the main product lines offered by Littelfuse?

Littelfuse offers comprehensive industrial protection and control product lines, including fuses, fuse holders, protection relays, temperature sensors, and electrical safety components. Their key product categories span surge protective devices, custom OEM products, electrical switch panels, medium voltage fuses, ground-fault protection relays, motor and pump protection devices, and temperature sensors. These products are designed to minimize electrical safety hazards, limit equipment damage, improve productivity, and safeguard personnel from electrical faults.

What are the key features of Littelfuse products?

Littelfuse products feature exceptional circuit protection technologies with key characteristics including UL/IEC safety standard compliance, low internal resistance, and advanced protective capabilities across multiple product lines. Their components provide critical protection for industrial systems, offering features like overcurrent protection, voltage transient suppression, and resettable protection devices with ultra-low resistance and compact designs. Key product lines include fuses, metal oxide varistors (MOVs), TVS diodes, PolySwitch devices, and specialized electronic protection components that enhance system reliability and safety.

What environmental ratings do Littelfuse products have?

Littelfuse products feature comprehensive environmental ratings, including NEMA Type 1, 2, 3, 3R, 4/4X, 12, and 13 certifications, as well as IP65 protection. These ratings ensure superior protection in diverse industrial environments, with an operating temperature range of -40°F to +131°F (-40°C to +55°C). Many products also include UV-stabilized materials and neoprene gaskets for enhanced durability in outdoor and challenging conditions.

What accessories are available for Littelfuse products?

Littelfuse offers several key accessories across their product lines, including fuse holders, voltage monitoring modules, and terminal connectors. Specific accessories include the LPSM003ZXID (indicating) and LPSM003Z (non-indicating) POWR-SAFE Dead Front fuse holders for Class CC and Midget-Style fuses, the VRM6048 voltage monitor accessory module, and female quick connect terminals (P1015 series) in various wire gauge sizes. These accessories are designed to enhance protection, monitoring, and connectivity for Littelfuse electrical components.

What is Littelfuse's warranty policy?

Littelfuse provides comprehensive warranty details on their official website at www.littelfuse.com/warranty. Customers should visit this page to review the specific warranty terms and conditions for their specific product lines. For direct warranty support or questions, customers can contact Littelfuse Technical Support at 1-800-TEC-FUSE or email [email protected].

What communication protocols do Littelfuse products support?

Littelfuse supports a comprehensive range of industrial communication protocols, including PROFIBUS, PROFINET, EtherNet/IP, DeviceNet, Modbus RTU, and CANopen. Our products provide flexible connectivity solutions across multiple industrial automation platforms, enabling seamless integration with various control systems and network architectures.

How are Littelfuse products typically installed?

Littelfuse products are typically installed using specialized mounting hardware like fuse holders, blocks, and panels designed for specific industrial applications. The POWR-SAFE Dead Front holders, for example, provide optimum protection for Class CC and Midget-Style fuses, supporting installations up to 600 VAC/DC. Installation often involves using precision terminals with strain relief, such as 0.25 in. female quick connect terminals, to ensure secure and safe electrical connections in industrial control systems.