ABB Sace TMAX XT XT4 ELECTRONIC

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Overview

Function Description
Important Technical Specifications
Usage Features
Maintenance Features

The provided document is an instruction handbook for the disassembly of the ABB SACE Tmax XT XT4 moulded case circuit breaker, specifically focusing on the electronic trip unit (type Ekip DIP LS/I). This document serves as a step-by-step guide for qualified personnel to safely and correctly disassemble the device, detailing the tools required and the parts to be separated for treatment.

Function Description

The Tmax XT XT4 is a moulded case circuit breaker designed for electrical protection. It is equipped with an electronic trip unit (Ekip DIP LS/I) which provides advanced protection functions. Circuit breakers like the Tmax XT XT4 are essential components in electrical distribution systems, designed to protect electrical circuits from damage caused by overcurrent, overload, or short circuit. When an abnormal current condition is detected, the trip unit signals the circuit breaker to open, interrupting the flow of electricity and preventing damage to equipment and ensuring safety. The electronic trip unit offers precise and customizable protection settings, making it suitable for a wide range of applications.

Important Technical Specifications

While the document primarily focuses on disassembly, some technical specifications can be inferred from the cover image and the parts list. The device is identified as "Tmax XTX 250P SER U-1000V" with a serial number "SNCO5123672162". It operates at various nominal voltages (Ue):

230/240V
415V
440V
525V
690V
500V
750V The rated current (In) is 250A. The ultimate breaking capacity (Icu) and service breaking capacity (Ics) are listed for different voltages:
At 230/240V: Icu = 200kA, Ics = 100kA
At 415V: Icu = 200kA, Ics = 100kA
At 440V: Icu = 100kA, Ics = 100kA
At 525V: Icu = 100kA, Ics = 100kA
At 690V: Icu = 70kA, Ics = 70kA The device is categorized as "Cat. A" and is suitable for 50-60Hz frequencies. It supports 2P and 3P in series configurations. It also complies with NEMA AB1 standards. The trip unit is an "Ekip LS/I" type, indicating Long-time, Short-time, and Instantaneous protection functions. The settings for the trip unit include:
Long-time protection (L): I1 = In x (0.4 + 2) with time delays (t1) of 12s, 1-311, and 36s.
Short-time protection (S): I2 = In x (1.5 + 10) with time delays (t2) of 0.1s and 0.2s.
Instantaneous protection (I): I3 = In x (1.5 + 10). The device is marked with "IEC60947-2" and "CE" indicating compliance with international and European safety standards for low-voltage switchgear and controlgear.

Usage Features

The Tmax XT XT4 is designed for robust electrical protection in various industrial and commercial applications. Its electronic trip unit allows for precise adjustment of protection parameters, enabling it to be tailored to specific circuit requirements. The "on" and "off" positions of the breaker handle are clearly visible, indicating its operational status. A "TEST" button is also present on the trip unit, allowing for functional testing of the protection mechanisms. The modular design, as implied by the disassembly instructions, suggests that components like the trip unit can be replaced or serviced, contributing to the longevity and adaptability of the circuit breaker. The presence of cap kits for connection terminals indicates a design that prioritizes safe and secure electrical connections.

Maintenance Features

The instruction handbook is entirely dedicated to the disassembly process, which is a key aspect of maintenance, repair, and end-of-life recycling. The document outlines a detailed, step-by-step procedure for disassembling the circuit breaker, emphasizing safety and the proper handling of components. Key maintenance-related features and considerations include:

Qualified Personnel Requirement: Disassembly must be performed by qualified and skilled personnel with relevant education and experience in the electrical field, highlighting the importance of expertise for safe maintenance.
Personal Protective Equipment (PPE): Mandatory PPE includes gloves, glasses, safety shoes, and protective clothes, underscoring a strong focus on worker safety during maintenance operations.
Specialized Tools: The document specifies the use of various tools such as Allen keys, flat screwdrivers, cross screwdrivers, Torx keys (sizes 8, 15, 20), cutters, and pliers, indicating that specialized tools are necessary for proper disassembly and maintenance.
Separate Treatment of Parts: Many disassembled parts require "separate treatment," particularly those containing thermoplastics with brominated flame retardants, magnets, or electronic components. This is crucial for environmental responsibility and proper recycling/disposal. Parts requiring separate treatment include:
- Cap kits (Plastic and Metal)
- Plug (Plastic)
- Operating mechanism (Plastic and Metal)
- Tripping shaft (Plastic)
- Trip lever (Plastic)
- Open/close lever (Plastic)
- Case side protections (Plastic)
- Protective cover (Plastic)
- Printed circuit board (Plastic, Metal, and Electronic components)
- Sensors (Plastic, Metal, and Mixture)
- Trip coil (Plastic, Metal, and Magnets)
Ergonomic Workspace: Disassembly activities must be performed in an ergonomic workspace to ensure the protection of personnel.
Energy Consumption: The document states that all disassembly operations are manual, leading to null/negligible CO2 equivalent emissions, which is a positive environmental aspect of its maintenance.
Detailed Instructions: Each phase of disassembly is meticulously described with clear actions, tools to be used, and illustrative pictures, ensuring that maintenance personnel can follow the process accurately.
Component Identification: The document provides a list of parts requiring separate treatment, along with their location and quantity, aiding in efficient sorting and disposal.

In summary, the ABB SACE Tmax XT XT4 is a robust electronic moulded case circuit breaker with advanced protection features, designed with a clear emphasis on safety and maintainability throughout its lifecycle, including detailed instructions for responsible end-of-life disassembly and component separation.