- Type 1/2 SPD - Imax 150kA per phase - In 20kA - NEMA Enclosure
MDS300E-277Y
MDS300E-277Y
Part Number: 890621
  • Surge Capacity to 300kA 8/20us Total
  • Lightning Capacity to 15kA 10/350us per phase
  • UL1449 Nominal Discharge Current (In) 20kA (All models)
  • UL1449 Short-circuit Current Rating (SCCR) 200kA (All models)
  • UL96A Master Label Compliant
  • Standard Diagnostics - % of protection present, audible, remote, test/mute
  • Replaceable Modular Design for SPD and Filter (if applicable)
  • Optional Listing as Type 2 Listed with UL1283 and cUL
  • NEMA 4/12 (Stainless Steel NEMA 4X optional)



POWER SPD TYPE UL1449 TYPE 1/2 LISTED
VOLTS (V) 480/277
AC/DC/DC PV/RF AC
PHASE (PH) 3Y
AMPS (A) n/a
AMBIENT MIN (C) -35
AMBIENT MAX (C) +85
MODES L-L, L-N, L-G, N-G
VPR (V) 2500/1800/1800/1200
MCOV (V) 840/420/420/275
IN (kA) 20
SCCR (kA) 200
IMAX (kA) 150
TECHNOLOGY Multi-TMOV
NETWORK CONFIGURATION 3PH, 4W+G, Wye
CONNECTION METHOD Screw Terminal (4-10AWG)
MOUNTING FLANGE MOUNT
MATERIAL Carbon steel
NEMA RATING (IP RATING) 3R/4/12
FAIL-SAFE BEHAVIOR Yes, no upstream over current protection required
REAL-TIME DIAGNOSTICS % of protection present LED, audible alarm and remote contacts. Optional surge counter.
DIMENSIONS See diagram
WEIGHT 10 lbs
UL STANDARD UL1449 4th Edition, UL1283
UL CATEGORY VZCA, VZCA7, FOKY, FOKY7
UL FILE NUMBER E326289, E467909
ANSI/IEEE C62.41 Category C 20kV/10kA
ENVIRONMENTAL STANDARDS ROHS