Dongfa Intelligent supplies the HR17B Series Fuse Switch Disconnector for low-voltage distribution systems requiring circuit isolation and fuse-based short-circuit protection. The integrated assembly combines switching and fuse protection in one device. The switch provides manual isolation and normal-current switching, while the specified fuse link interrupts short-circuit current according to its rated characteristics.
The series is available from 40A to 630A and supports 2P and 3P configurations. Compatible fuse links include RT14-40, RT14-63, NT00-160, NT1-250, NT2-400, and NT3-630. Before selection, the rated operating current, fuse link model, system voltage, installation dimensions, and application conditions should be checked together.
The HR17B combines a disconnecter and fuse link in one switching assembly. The switch is used for circuit isolation and normal-current operation, while the fuse link provides short-circuit protection. This integrated configuration combines switching and fuse protection in one assembly, simplifying the overall protection arrangement within the distribution system.
When a short-circuit fault occurs, the fuse link melts and interrupts the fault current directly. The switch body is mainly responsible for isolation and normal-current switching. When coordinated with the specified fuse link, the series has a rated limited short-circuit current Inc of up to 50kA. The 50kA value applies to the specified switch and fuse combination. It should not be interpreted as the standalone short-circuit breaking capacity of the switch body. System short-circuit level, fuse link specification, rated operating current, and installation conditions should be considered together during selection.
The protective cover allows the fuse condition to be checked visually. When fuse replacement is required, the circuit should first be safely isolated and de-energized. The replacement fuse link should match the required model and rating for the selected HR17B configuration.
The HR17B Fuse Switch Disconnector series is rated AC-23B for switching applications involving motor loads and other highly inductive loads within the specified operating conditions. It can also be used for isolation and fuse protection in low-voltage AC distribution circuits where the applicable ratings, fuse configuration, and installation requirements are met.
| Parameter | Specification |
| Product Type | Fuse Switch Disconnector |
| Product Series | HR17B |
| Rated Operating Current | 40A to 630A |
| Pole Configurations | 2P / 3P |
| Rated Operating Voltage | 400V |
| Rated Insulation Voltage | 690V |
| Rated Limited Short-Circuit Current | Up to 50kA (with specified fuse link) |
| Compatible Fuse Links | RT14-40, RT14-63, NT00-160, NT1-250, NT2-400, NT3-630 |
| Utilization Category | AC-23B |
The HR17B Fuse Switch Disconnector is intended for low-voltage AC electrical systems where manual isolation and fuse-based short-circuit protection are required. Typical applications include:
For standard orders, confirm the rated operating current, number of poles, fuse link model, system voltage, utilization requirements, mounting dimensions, and required quantity. The fuse link should correspond to the selected HR17B model and rated operating current.
For replacement projects, check the original equipment and installation dimensions before ordering. Provide the following information:
For replacement applications, providing the original model and available mounting dimensions allows the configuration to be checked before production and helps reduce the risk of an incompatible model or mounting arrangement.
Standard HR17B products support a minimum order quantity of 1 unit. Standard lead time is 7-15 working days. Custom products generally require 15-30 working days, depending on the configuration and production requirements.
Dongfa Intelligent operates under ISO 9001, ISO 14001, and ISO 45001 management system certifications. The company supports OEM and ODM requirements and has experience serving customers in Southeast Asia and parts of Europe.
The standard HR17B is specified for AC 400V applications. For photovoltaic DC circuits, a switch-disconnector specifically rated and tested for the applicable DC voltage and PV operating conditions should be selected.
The HR17B uses a fuse for short-circuit protection, and the fuse link needs to be replaced after operation. An MCCB uses a trip mechanism and can normally be reset after a trip, depending on its configuration. The selection should be based on the required protection functions, maintenance method, operating frequency, and circuit design.
IEC 60947-3 is the international standard covering switches, disconnectors, switch-disconnectors, and fuse-combination units within its applicable scope. The applicable standard and conformity requirements should be confirmed against the specific product documentation and target market requirements.
Check the model, rated operating current, number of poles, fuse link specification, mounting dimensions, and available cabinet space. Before installation or fuse replacement, the circuit should be isolated and de-energized according to the applicable electrical safety procedures. Terminals and components should also be installed according to the applicable product instructions.
The HR17B Fuse Switch Disconnector is rated AC-23B for switching applications involving motor and inductive loads within the specified operating conditions. However, its primary functions are switching, isolation, and fuse-based short-circuit protection. For frequent motor starting and stopping, a suitable contactor or motor starter should be selected according to the motor control requirements.
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