INTERCONNECT


ITT demonstrate flexibility for Mil-DTL 38999 connectors


Global connector manufacturer and supplier ITT is renowned as an industry leader in reliable Mil- DTL 38999 connectors for military applications, with an enviable track record stretching back over 30 years during which time it has supplied more than 40 million interconnects to this important market. As well as the standard Mil- DTL 38999 qualified connectors, ITT regularly tackles custom and value-added designs. The company’s value added service modifies products to suit customer needs without increasing costs. In addition, ITT engineers are skilled at creating customised connectors to provide innovative solutions and solve customers’ interconnect problems. For example a customer recently requested a high durability, low cost Mil-DTL 38999 series II connector which included a contact for a printed circuit board and a rear seal for use in corrosive environments. In addition to the requested custom features, they wanted the ability to withstand thermal cycling and be


POWER


Safety in medical equipment starts with the supply of power


Electrical equipment used in medical technology must fulfill high requirements in terms of safety. This protects both the patient and medical staff. This protection begins with the safe supply of electric power. SCHURTER offers a wide range of power


sockets and power entry modules with and without power-line filters as well as filters. These products fulfill the requirements of the base standard for medical electrical equipment, IEC/ UL 60601-1 and can generally be used in most equipment without additional testing.


POWER FEED


It is recommended to include a mechanism to protect against any unintentional removal of plugs from the equipment’s power sockets. In addition to cord-retaining brackets, SCHURTER offers the V-Lock cord retaining solution. With the V-Lock, the power socket is equipped with a notch that interlocks with a special latch on the connector on the power cord. The system


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prevents the cord from being pulled out of the socket unintentionally.


FUSE HOLDERS All medical electrical equipment should be equipped with a double-pole fuse holder that can only be opened up with the help of a tool. It must further be ensured that only authorized personnel can remove or replace fuses. For this, SCHURTER offers the «Extra-Safe» fuse drawers.


POWER-LINE FILTERS The power-line filter protects the equipment from external HF interference and reduces the HF interference radiated by the equipment. Y capacitors wired between the power supply lines and earth within the power-line filter produce a leakage current to earth. This fault current can trigger the fault interrupter whereby the power supply is shut off. Thus, touch leakage current for medical electrical equipment may not exceed 100 µA, and for devices with direct patient contact, it even drops down to 10 µA. As a result,


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power-line filters for medical electric equipment do not have any Y capacitors, which results in a maximum leakage current of 5 µA, or they have only very small Y capacitors such as of 470 pF, which results in a peak leakage current of 80 µA. If you pull a power cable out of a power


socket, the stored voltage from the X capacitors is still present on the power pins. If touched, they can result in an electrical shock. Thus, medical electrical equipment with detachable power connectors may only have a maximum of 60V on the touchable plug pins one second after the plug has been pulled. To achieve this, a bleeder resistor is switched in between the phase and neutral conductors, and it discharges the capacitor in a very short time.


compounds in order to meet the customer’s stringent testing requirements.


The project had to run on a tight timescale during both the design and manufacturing stages, which was achieved by very close cooperation between ITT’s design engineers and its manufacturing facility. The teamwork proved flexible enough to cope with two customer design changes during the project leading to a successful ongoing commercial engagement.


Applications for the low-cost hermetic


air pressure sealed to a mandatory 5 psi. The specified connector had to be created as a modified existing product, as the customer was unwilling to carry additional tooling expenses and also required the custom interconnect to be intermateable with standard Mil-DTL 38999 connectors. ITT engineers re-designed the rear insulator and shell of an ITT Mil-DTL 38999 series II series connector to incorporate an epoxy compound. ITT’s design engineers created this low-cost alternative to a hermetic product by evaluating many different types of epoxy


custom MIL-DTL 38999 connector with printed circuit board contact include but are not confined to: military communications systems, such as portable radios and military vehicle radios.


Avnet Abacus Interconnection Product Specialists can work closely with their ITT counterparts to bring this level of flexibility & value add to the customer design, where it is required to ensure cost effective or technology driven solutions.


focus magazine - issue 12


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