Hydraulic DC circuit breaker B3T1-250A 80V

Product Overview

The YM B3T1-250.0 is a robust, high-current hydraulic-magnetic circuit breaker engineered as a premium-grade, direct replacement for QY-Series miniature breakers in demanding 80VDC systems. Designed for 250A applications, this unit is available in both 2-pole and 3-pole configurations, making it a versatile solution for protecting critical high-power DC circuits. It is an indispensable component for advanced industrial hydraulic power unit wiring diagrams and high-capacity circuit breaker panels, providing reliable, precise, and durable protection for expensive equipment and ensuring system uptime.

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Technical Specifications

Model: B3T1-250.0 80-3601 (B-D2-C1-G-H) | Configurations: 2-Pole or 3-Pole | Rated Current: 250A | Rated Voltage: 80VDC

• Coil Power Consumption: 0.3W to 0.43W.
• Contact Load & Electrical Life:
  • Resistive Load: 1A at 28V DC for 100,000 operations.
  • Low-Level Load: (10-50)µA, (10-50)mV for 100,000 operations.
• Contact Resistance: Initial ≤50mΩ; After Life Test ≤200mΩ.
• Time Parameters: Ultra-fast action and release time ≤4ms (Typical action time ≤3ms). Incentive pulse width 10-50ms.
• Dielectric Strength (Withstand Voltage):
  • Normal Atmospheric Pressure: 500V RMS, 50Hz.
  • Low Pressure (e.g., High Altitude): 250V RMS, 50Hz.
• Insulation Resistance: >500MΩ (Normal); >50MΩ (After High-Level Life Test).
• Weight: Extremely lightweight at <3 grams.
• Sealing (Tightness): High integrity with a leakage rate ≤1x10^-3 Pa·cm³/s.
• Operating Temperature: Coil voltage specified at 25°C (77°F).

Product Features & Advantages

• High-Current Capacity: Engineered for 250A applications, ideal for main power distribution in systems like large monarch dc hydraulic power units or heavy-duty vehicle electrical systems.
• Precise Hydraulic-Magnetic Trip: Provides consistent, temperature-stable trip characteristics, crucial for reliable hydraulic circuit breaker operation in varying environments.
• Direct QY-Series Replacement: Form, fit, and functional alternative designed to simplify the upgrade or repair process without system modification.
• Fast Fault Response: Sub-4ms trip time minimizes energy let-through during short circuits, offering superior protection for sensitive downstream components.
• Robust Construction for Demanding Environments: Suitable for aviation, rail, and industrial applications where vibration, shock, and variable pressures are concerns.
• Dual Configuration Flexibility: Available in 2-pole (2 pole circuit breaker definition) and 3-pole versions, offering design flexibility for different circuit breaker dc control schematic needs.

How to Integrate This Breaker

1. Verify Requirements: Confirm your system's voltage (80VDC), current (250A), and required number of poles (2 or 3).
2. Review System Schematics: Cross-reference the B3T1-250.0 dimensions and terminal layout with your existing panel design or 3 pole circuit breaker wiring diagram.
3. Safe Power Down: Completely isolate and lock out all power sources to the installation panel.
4. Installation & Wiring: Mount the breaker securely. Follow proper hydraulic power unit wiring diagram practices, ensuring all high-current connections are tight and correct for the pole configuration.
5. Functional Verification: After installation, perform a manual operation test and, if possible, a calibrated high-current test to verify the hydraulic operating mechanism of circuit breaker functions correctly.
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Application Scenarios

This high-amperage breaker is critical in applications where DC power reliability and safety are non-negotiable:

• Aviation & Aerospace: Primary power protection for drone propulsion systems, aircraft auxiliary power units (APUs), and aviation engine starters.
• Rail Transportation: Circuit protection within train control systems, lighting, and auxiliary power circuits.
• Industrial Machinery: Protecting the DC drive and control circuits of large industrial machines, including those with complex electric over hydraulic pump wiring diagrams.
• Marine & Naval: DC distribution panel protection in vessels using 80VDC systems.
• Energy Storage & EV Charging: Main DC disconnect or protection in battery storage racks and high-power DC charging infrastructure.

Value Proposition for B2B Buyers

• Reduce System Failure Risk: High-precision protection safeguards capital-intensive equipment, reducing costly downtime and repairs.
• Streamline Supply Chain: A reliable, high-quality alternative to potentially discontinued or long-lead-time QY-series components.
• Enhance Product Reliability: Integrating YM breakers into your products or panels increases their overall market value and reliability reputation.
• Design Support: Access to expertise for integrating this hydraulic-magnetic circuit breaker into your specific 8 circuit breaker panel or system layout.

Quality Assurance & Customization

YM breakers are manufactured under a strict quality management system. We understand that standard parts may not fit every project. We offer customization options on parameters such as specific terminal types, custom labeling for OEM clients, and consultations for integration into specialized systems like those requiring a unique hydraulic electric circuit breaker interface.

FAQ

Q1: What does "hydraulic-magnetic" mean, and why is it better for my application?

A1: A hydraulic magnetic circuit breaker uses a magnetic coil and a hydraulic damping delay. It provides a precise, fixed trip point unaffected by ambient temperature (unlike thermal breakers), making it ideal for environments with temperature fluctuations and where consistent performance is critical.

Q2: Can this 250A breaker be used to protect a lower current circuit, like 150A?

A2: No. Circuit breakers are sized to protect a specific circuit. Using a 250A breaker on a 150A circuit would not provide proper overload protection and could be a fire hazard. Always match the breaker's rating to the circuit's design current.

Q3: What is the main difference between a 2-pole and a 3-pole breaker in a DC system?

A3: A 2-pole breaker simultaneously interrupts two conductors (e.g., positive and negative). A 3-pole breaker interrupts three conductors and is used in more complex DC systems, such as those with a grounded mid-point or multiple branched circuits. The choice depends on your specific circuit breaker 1 pole vs 2 pole (or 3-pole) system design.

Q4: Is this product suitable for use in a dc powered hydraulic pump circuit?

A4: Absolutely. The B3T1-250.0 is an excellent choice for providing overcurrent and short-circuit protection in the high-current supply line to a dc powered hydraulic pump, preventing motor damage from electrical faults.

Q5: Do you provide samples for testing and qualification?

A5: Yes, we support our B2B clients with sample programs to allow for engineering evaluation and integration testing before bulk orders.