2022 AREL Trapped Key Catalogue
82Pages

“Quality means doing it right when no one is looking.” Henry For

THE COMPANY The company, born in 1965, has over 50 years of experience in the market of handles, locks and mechanical interlocking systems production for MT/AT electric implants. The lock brand AREL® is largely recognized as the setting reference of mechanical and electromechanical interlocks. Quality and flexibility in the production of personalized solutions are strength points that gave us the opportunity to occupy a significant, and constantly growing, place in the market. Project of 1982, made in Venezuela. Arel interlocks are included in the design specification. Frigo Tullio has...

BRIEF HISTORY ’70s Arel in the early 1970s introduced the first modern interlocking systems for people and plant safety in Italy. 1965 Tullio Frigo founded Arel, a family business of which he is still President. The range of products has expanded, including “quarter turn”, handles and hinges for the electrical industry. Thanks to the skills gained in Process Safety Design and its technical know-how in product customization, AREL® has become the reference interlocks manufacturer for the entire Italian industry. In recent years, with Eng. Gianpaolo Frigo joining the company, Arel has embarked...

SAFETY INTERLOCKS An interlock is a closed and interconnected system of locks and elements for the sequential distribution of keys. DESCRIPTION The fundamental element of the word “interlock” is the prefix “inter”, through which the idea of interconnection of elements and sequentiality of the key distribution is conveyed. Without interconnection and sequentiality, we lose the systemic dimension which differentiates interlocks from simple locks. Through interconnections and sequentiality of key distribution it is possible to design infinite mandatory sequences of actions. These sequences...

HOW INTERLOCKS FUNCTION In order to fully comprehend the great applicative potential of interlocks it is necessary to further explore the functioning mechanisms, that is the way in which the interconnection between the elements of the system and its unequivocal dimension is generated. Starting point of the system, which is composed by at least two elements, is the functioning mechanism of the single lock and its correct installation. Overlooking the aspects related to the installation, which are important but represent an exogenous variable, we will focus on the lock functioning and we will...

Through the combination of the first two positions (Open – Closed) it is possible to unequivocally define the position of the single element, and through the combination of the two states (Key trapped – Key free) it is possible to activate the interconnection with the other elements of the system. The single elements of the interlocking system are classified in three macro-families of products, differing in their function: The LOCKING OPERATION is the element allowing the isolation of the danger for the worker, being it electrical or mechanic. Through this isolating action the non-dangerous...

THE LANGUAGE During the course of its 50 years of history, AREL® has developed it’s own language for interlocking, allowing the integration of safety procedures into the design of the systems. The first design schemes were created towards the end of the Fifties and were born from the design tradition of French security. The experiences of design developed during the course of years in different sectors have brought an evolution of design schemes with the development of its own alphabet in which ad hoc developed symbols represent the two sets of positions (Open – Closed; Key trapped – Key...

INDEX ISOLATION APPLICATION EXAMPLES PG 8 KEY EXCHANGE BOXES APPLICATION EXAMPLES PG 18 ACCESS CONTROL APPLICATION EXAMPLES PG 22 KEY EXCHANGE BOXES PRODUCTS PG 54 ACCESS CONTROL PRODUCTS PG 66

APPLICATION EXAMPLES

APPLICATION EXAMPLES INTEGRATED SECURITY SYSTEM FOR ACCESS CONTROL TO HAZARDOUS AREAS DPN2 Dual interlocked key access interlock APPLICATION DESCRIPTION The key switch for circuit breakers has been when the power supply has been cut or other- designed to function as part of an integrated wise switched to safe conditions. The machine safety system combined with access control cannot therefore be restarted until the door is to hazardous areas. Typical machines that use closed and the key removed to be inserted in the key switch on disconnector and switchge- the operating lock (key switch of...

APPLICATION EXAMPLES MACHINE GUARDING DP1 Single key door lock DC1 Powersafe electrical switch APPLICATION DESCRIPTION A typical application for the protection of which is then removed and brought into the environments and machinery with mul- electric lock switch. tiple access points, provides for the use of an electrical switch with single key operation. It is usually used in conjunction with a single-key access unlocking device. The key-operated electrical switch interrupts the machine’s safety circuit, ensuring that the machine is locked when the key is turned and removed. The key can...

APPLICATION EXAMPLES PROTECTION OF MACHINERY WITH MULTIPLE ACCESS TO HAZARDOUS AREAS D1BCPX Elettro-mechanical interlocking distributor APPLICATION DESCRIPTION Dual interlocked key access interlock A typical application for the protection of en- enabling the release of the keys to the person- vironments and machinery with multiple ac- nel. These keys can then be used to unlock the cess points, provides for the use of an elec- double key access locks. tric switch with multiple operating keys. It is The protections can only be opened when the usually used in combination with a double power...

APPLICATION EXAMPLES ACCESS CONTROL TO UNINTERRUPTIBLE POWER SUPPLIES (UPS) DPN2 Dual interlocked key access interlock DKS1B2CPX Solenoid controlled switch APPLICATION DESCRIPTION A typical application for controlling access to uninterruptible power supplies (UPS) is the use of a solenoid-controlled key switch. When the machinery is in a safe state to allow access; the UPS system sends a signal to the lock to energize the solenoid, thus allowing the rotation and extraction of the key. Interrupting the UPS power supply. The key can then be taken to access the protected area. The UPS can not...