DT1M27531R Class I & Class II 25kA @10/350us


Download Product Brochure herehttps://www.erico.com/part.asp?part=DT1M27531R

Surges and voltage transients are a major cause of expensive electronic equipment failure and business disruption. Damage may result in the loss of capital outlays, such as computers and communications equipment, as well as consequential loss of revenue and profits due to unscheduled system down-time. nVent ERICO offers multiple series of surge protective devices (SPDs) suitable for a vast range of applications that provide reliable protection from voltage transients on power distribution systems. The DT1M Series DIN Rail Surge Protective Devices provide reliable and efficient protection against voltage transients within the IEC Class I (25 kA) environment. Tested and independently certified to the IEC standard, the DT1M Series provides a range of compact, safe and high surge rated performance features for the harsh IEC Class I environment and suitable for protection within a wide range of applications.

Additionally, the nVent ERICO DT1M Series sets itself apart from the competition with an innovative and unique technology. This technology advancement provides spark gap-like performance with MOV current extinction. The same technology allows the DT1M Series to be thinner than the competition by as much as 50% and can also be universally coordinated with any Class II or Class III SPD.


  • Spark gap surge performance with MOV-like current extinction
  • Universally coordinated with any Class II or Class III surge protection devices
  • Follow current limitation, no tripping of a 16 A gG fuse
  • Compact, yet high surge rated pluggable design, using minimum DIN rail width
  • Retaining clip ensures enhanced vibration and shock resistance performance
  • Red/Green status indication and change-over contacts standard for remote monitoring
  • Includes thermal disconnect for safe end of life


Part Number DT1M27531R
Nominal System Voltage (Un) 220/380 – 240/415 VAC
Max Continuous Operating Voltage (Uc) 275 VAC L-N
305 VAC N-PE
Nominal Discharge Current (In), IEC 25 kA 8/20 μs L-N
100 kA 8/20 μs N-PE
Max Discharge Current (Imax), IEC 65 kA 8/20 μs L-N
150 kA 8/20 μs N-PE
Impulse Current (Iimp) 25 kA 10/350 μs L-N
100 kA 10/350 μs N-PE
Voltage Protection Level (Up), L-N 1,800 V
Voltage Protection Level (Up), N-PE 1,500 V
Back-Up Fuse @ Isccr 315 A @ 50 kA
Frequency 50 – 60 Hz
Response Time 100 ns Max
Short Circuit Current Rating (Isccr) 50 kA
Distribution System TN-S
Protection Modes L-N
Follow Current Interrupt Rating (Ifi) 50 kA L-N
100 A
Temporary Over Voltage 120 min (Ut/mode), L-N 442 V Withstand
Temporary Over Voltage Withstand 200 ms (Ut), N-PE 1,200 V
Technology Thermal Disconnect
Connection, Solid 35 mm² Max
Connection, Stranded 25 mm² Max
Torque (TQ) 4.5 N-m
Altitude 2,000 m Max
Humidity 5 – 95 % RH
Temperature -40 to 70 °C
Enclosure Material UL® 94V-0 Thermoplastic
Enclosure Rating IP 20
Mounting 35 mm top hat DIN rail
Remote Contact Switching Capacity 1.0 A @ 250 VAC
1.0 A @ 125 VAC
0.5 A @ 48 VDC
0.5 A @ 24 VDC
0.5 A @ 12 VDC
Remote Contacts Yes
Status Indication Mechanical flag
Depth (D) 85 mm
Height (H) 90 mm
Width (W) 72 mm
Unit Weight 0.69 kg
Replacement Module DT1M27531M
Complies With EN 61643-11 Type 1, Type 2
IEC® 61643-11 Class I, Class II
Certifications CE, ERICO DT1M
Standard Packaging Quantity 1 pc
UPC 78285698730
EAN-13 0782856987307


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