Designed to bypass supply to the load for isolation during service and maintenance, IPD offers ABB’s extensive range of manual bypass switches which are the optimum solution.

A manual bypass switch is beneficial as it allows service and isolation for safety purposes without loss of power to the load. Conventionally, bypass switches are built by using individual switch disconnectors and conversion kits. ABB’s manual bypass switch solution consists of one single device without conversion kits which saves installation space and cost. Safe maintenance of equipment while the load is being supplied directly from the source is achieved as ABB’s bypass switches fulfill isolating requirements without additional devices thus ensuring safety and dependability. 

How is a Bypass Switch different from a Switch Disconnector?

In simple terms, a bypass switch redirects power to the load by isolating the relevant branch of the electrical circuitry for service and maintenance whereas a switch disconnector shuts off power completely. A switch disconnector is used to disconnect or isolate an entire or specific part of an electric circuit in case of faults from the main power supply for maintenance purposes. It doesn’t interrupt any current, nor does it redirect current.

How does the process of bypassing the supply take place?

The process of bypassing the supply to the load can be done by two types of available transitions, namely open transition and closed transition. A closed transition is also called a ‘make before break’ transition, where the two power sources (utility and backup) are momentarily overlapped to limit the brief falter in power during transfer (I-I+II-II). An open transition on the other hand is called ‘break before make’ transition, where there is momentary disconnection from the two power sources (utility and backup) before transfer (I-0-II)

The basic functionality and the three positions of transition is illustrated in a simplified diagram below.

Why ABB Manual Bypass Switches?

A seamless and secure transition from one power source to another is of highest importance. Either planned or unplanned, a speedy switch to back-up power is often critical. IPD offers ABB’s manual bypass switches which are the optimum solution for bypassing the load when the installation space is very limited. ABB manual bypass switches are designed, built and tested for the most excellent possible operation. These switches are designed to be practically maintenance free across their entire extended life cycle and offer reliable performance in any and all possible situations. Robustness has been assured by testing switches against the IEC 60947-6-1 standard. 

ABB manual bypass switches come equipped with a comprehensive range of inbuilt safety features such as mechanical interlock. The switches are manually operated, and the range goes from 160 to 800 Amperes, compliant with globally recognized standards (IEC 60947-3). ABB’s manual bypass switches are available in 4 pole open and closed transition. Its black plastic IP65 pistol handle and pistol handle extension ensure smooth manual operation and leaves a small footprint. The closed transition switches have overlapping contacts and optional bridging bars. The handle extension is snap on mounted on the standard handle for manual operation. when padlocking the standard handle, the handle extension needs to be removed for safety purposes. Inferring, handle is padlockable in the 0-position, door interlocking is possible in the I- and II-positions and when padlocked.