Ltb 72.5-170d1 B Manual !!link!! Jun 2026
01-MAY-1985 2. REPORT TYPE: Technical Manual 3. TITLE AND SUBTITLE: Operator's Manual for Trailer, Low Bed, 72.5-Ton Capacity, M172A1 (NSN 2300-00-249-3604) 4. AUTHOR(S): Headquarters, Department of the Army 5. ABSTRACT: This publication is an Operator's Manual for the M172A1 Low Bed Trailer. The manual provides instructions for operation, preventive maintenance, and troubleshooting for the trailer under normal and extreme conditions. The manual covers the M172A1 trailer which is used to transport heavy equipment such as tanks, artillery, and construction equipment. It includes information on payload securing, coupling and uncoupling, driving maneuvers, and emergency procedures. 6. KEY TERMS: M172A1, Low Bed Trailer, Heavy Equipment Transporter, 72.5-Ton, M172, HET 7. NUMBER OF PAGES: 60 8. SECURITY CLASSIFICATION: UNCLASSIFIED
| Parameter | Value | | :--- | :--- | | | 72.5 kV / 145 kV / 170 kV | | Rated Frequency (Fr) | 50 / 60 Hz | | Rated Continuous Current (Ir) | Up to 3150 A standard / Up to 4000 A on request | | Rated Short-Circuit Breaking Current (Isc) | 40 kA (symmetrical) | | Short-Time Withstand Current | 40 kA (for 1 or 3 seconds, depending on version) | | Lightning Impulse Withstand Voltage | 325 kV (for 72.5 kV) / 650 kV (for 145 & 170 kV) | | Operating Mechanism Type | Spring-operated mechanism (e.g., BLK 222) | | Mechanical Endurance | Approximately 10,000 operations | | Standards | IEC & IEEE |
Measurements of contact resistance, operating times, and contact wear. 6. Safety and Environmental Information
Never attempt to disassemble the main drive spring casing. Spring force exceeds 2,500 N. Refer repair to factory-trained personnel.
Periodic verification of switching times, speeds, and the simultaneous closing of all three contacts. Key Technical Data (Representative) Specification Value/Type Rated Voltage 72.5 kV – 170 kV Max Breaking Current Up to 40 kA Operating Mechanism BLK 222 / FSA 1 Insulation Medium Operating Temperature -50°C to +40°C (typical) LTB 72.5-170D1/B Circuit-Breaker Manual | PDF - Scribd ltb 72.5-170d1 b manual
: The user query "ltb 72.5-170d1 b manual" contains a slight deviation from standard US Army Nomenclature.
The LTB 72.5-170D1/B is a high-voltage, sulfur hexafluoride ( SF6SF sub 6
The LTB D series is trusted for numerous applications. It is well-suited for protecting major assets such as transmission lines, power transformers, and capacitor banks. The LTB D model also excels in high seismic activity regions and extreme climates.
The is a high-voltage SF6 (sulfur hexafluoride) live-tank circuit breaker manufactured by ABB . It is designed for outdoor or indoor installation in substations to control and protect electrical networks . 1. Technical Overview Voltage Range: 72.5 kV to 170 kV . 01-MAY-1985 2
The LTB mechanisms and interrupters are designed for low maintenance.
Pre-operation checklists, including gas filling procedures and timing tests.
Operation of the breaker is managed through an integrated operating mechanism, often the BLK or FSA type. These mechanisms provide the mechanical energy required for opening and closing the contacts. The manual provides instructions on charging the springs, manual tripping procedures, and the use of electrical control circuits for remote operation.
The "D1/B" designation typically refers to a specific configuration (often single-column or three-pole operation) that allows for easier transport and installation. Community & Expert Perspective AUTHOR(S): Headquarters, Department of the Army 5
The design is optimized for easy, adjustment-free installation, reducing commissioning time.
Without the , technicians risk improper reassembly, incorrect torque settings, and voiding any remaining warranty or liability insurance.
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