MDL-1-1/4-R

Package / Case:	3AB, 3AG, 1/4" x 1-1/4"
DC Cold Resistance:	0.205 Ohms
Size / Dimension:	0.250" Dia x 1.250" L (6.35mm x 31.75mm)
Color:	--
Operating Temperature:	--
Approvals:	CE, CSA, UL
Melting I²t:	86.2
Breaking Capacity @ Rated Voltage:	100A
Mounting Type:	Holder
Series:	MDL
Response Time:	Slow
Voltage Rating - AC:	250V
Current Rating:	1.25A
Fuse Type:	Cartridge, Glass
Moisture Sensitivity Level (MSL):	--
Part Status:	Active
Lead Free Status / RoHS Status:	--
Packaging:	Bulk

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The Application Field and Working Principle of MDL-1-1/4-R Fuses

The MDL-1-1/4-R fuses belong to the family of current-limiting fuses. They are commonly used when high voltage transmission lines need to be physically and electrically protected in the most efficient way. These fuses can be used on many industrial and residential applications, such as power transformers, dry-type transformers, motor control centers, switchgear, and circuit-breaker panels.The MDL-1-1/4-R fuses function as current limiters, protecting the equipment from being burnt out due to an uncontrolled sudden rise in current. The fuses protect from power surges and short circuits that can potentially create hazardous conditions. Unlike normal circuit breakers, these current-limiting fuses are able to interrupt the electricity supply much faster, within nanoseconds, which helps to limit the damages. In order to achieve the current-limiting power, these fuses have to be rated at a much higher voltage than the system they are protecting.The working principle of MDL-1-1/4-R fuses is quite simple, as all other current-limiting fuses. They are made from two pieces of metal linked by a current carrying conductor. Normally, the metal pieces remain open, acting as a barrier to interrupt the current to the connected equipment. When the current rises beyond the rated level, the armature melts due to the heat generated from the current flow, thus disrupting the current flow and protecting the equipment.MDL-1-1/4-R fuses are quick acting and highly reliable in low voltage and high current applications. In order to ensure reliability, they must carefully and precisely calibrated so that they are able to detect small faults in a reliable and consistent manner. Furthermore, as these fuses are specially designed to be very fast and responsive, they must be well matched to the equipment they are protecting in terms of ratings and features.In a nutshell, MDL-1-1/4-R fuses offer the best protection when used in residential and industrial applications. They are able to detect and interrupt a high voltage current in a fraction of a second, thus helping to prevent major electrocution and equipment damages. While they are designed to be extremely quick and responsive, these fuses must also be carefully and precisely calibrated to ensure that they work in the best possible manner.

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