Suitable for In-building Electrical Power Applications
such as Power Distribution panel.
ZERO SCREW™ Terminal block EF2 series
Prevent fires in the power distribution panel by not using screws.
Shortening of construction hours.
ZERO SCREW™ Terminal Block EF2 series is a spring terminal block that can connect cables to electrical equipment such as power distribution in buildings without using screws. The elimination of screws saves installation works and maintenance. In addition, it prevents accidental fires triggered by the loosening of screws in electrical power applications.
Prevention of fire in electrical equipment
such as a power distribution panel.
Failure of electrical equipment is the cause for approximately a quarter of the fires. If a fire occurs, the reliability of developers, construction companies and equipment suppliers will all be degraded, as well as endangering lives. One of the causes of ignition in this electrical equipment is loosening of the screw due to aging.
Since the ZERO SCREW™ terminal block EF2 series is spring-loaded, there is no concern of screw loosening. A good connection is maintained by IDC, and the fire risk of electrical equipment is reduced.
Reduction of work hours and shortening
of construction period
The ZERO SCREW™ terminal block EF2 series connection method is a single action of inserting standard ring terminals.
Compared with the conventional screw-type terminal block, it is possible to eliminate the need for checking operations such as unscrewing, screwing, and torque checking. It is possible to reduce the number of work hours by more than 40% and thereby shorten the construction period.
Stable connection quality
which does not rely on operator’s skills
During electrical equipment maintenance, EF2 can standardizes the installation quality since there is no variation in operator skill, such as "tightening of screws is not appropriate" A stable connection is maintained regardless of the operator.
Simplifying the construction process
KAJIMA CORPORATION, which builds skyscrapers, shopping centers, dams and bridges with civil engineering technology, implements environmental conservation efforts and earthquake disaster countermeasure technology into their construction. In order to save labor resources and attract new workers, Kajima Corporation began use of Hirose’s Zero Screw™ terminal block EF2 series. The deputy director of the Tokyo Building branch, Mr. Hiroshi Mizui, describes the effects of implementing this connector. (Published January 10, 2019)
Utilization as a new main electricity junction, changes the construction process.
On November 30, 2017, TAKENAKA CORPORATION, which is involved in the construction of various facilities such as commercial buildings, stadiums, schools and educational facilities, etc., built, the "Meguro CENTRAL SQUARE", using our ZERO SCREW™ terminal block EF2 series which was adopted as the main electricity junction for the electric wire in the electrical equipment construction. We interviewed Mr. Shin Tomoyuki, Senior Manager, Mechanical & Electrical Engineering Department, Tokyo Main Office, TAKENAKA CORPORATION. (Published July 23, 2018)
ZERO SCREW™ Terminal Block EF2 Series Features
Easy connection with standard ring terminals
Quick and secure single action positive lock design. Unlike a conventional screw terminal block, the operator can maintain stable work quality even if they do not use to it. In addition, it is easy to use in narrow and dimly lit places.
Improvement of contact reliability
Unique design for pressing the ring terminal directly against the bus bar for connection. Contact reliability is improved and a stable connection is maintained over a long-term.
Wiring work movie
Wiring in the board
Lead-in external lines
Work hours comparison
Solar power generation equipment
Product lineup EF2 series
|Rated Voltage||Operating Temperature||Storage Temperature||Contact Resistance||Insulation Resistance||Withstanding Voltage||Mating Durability|
(Including the temperature rise by current flow.)
|-10 to +60℃||1mΩ
|2500 AC for 1 Min.||50 times|
|5000V AC for 1 Min.|