RM4TA31
Product ID:33248
Updated: 2026/4/3
Key Features
- 1Detect phase asymmetry and faults in 3-phase networks. 2、Adjust time delay from 0.1 to 10 seconds precisely. 3、Achieve high durability with up to 30 million mechanical cycles. 4、Suit industrial measurement and control applications reliably. 5、Comply with IEC 60947-5-1 and VDE 0660 standards.
Technical Specifications
Detailed engineering parameters
| Parameter | Value | Parameter | Value |
|---|---|---|---|
| Range of Product | Harmony Relay | Relay Type | Control relay |
| Product Specific Application | For 3-phase supply | Relay name | RM4-T |
| Relay monitored parameters | Phase sequence<br />Phase failure detection<br />Asymmetry | time delay | Adjustable 0.1...10 s |
| Output contacts | 2 C/O | Contacts type and composition | 2 C/O |
| Poles description | 3P | [Ie] rated operational current | 2 A 158 °F (70 °C) 24 V DC-13 IEC 60947-5-1/1991<br />2 A 158 °F (70 °C) 24 V DC-13 VDE 0660<br />3 A 158 °F (70 °C) 115 V AC-15 IEC 60947-5-1/1991<br />3 A 158 °F (70 °C) 115 V AC-15 VDE 0660<br />3 A 158 °F (70 °C) 24 V AC-15 IEC 60947-5-1/1991<br />3 A 158 °F (70 °C) 24 V AC-15 VDE 0660<br />3 A 158 °F (70 °C) 250 V AC-15 IEC 60947-5-1/1991<br />3 A 158 °F (70 °C) 250 V AC-15 VDE 0660<br />0.1 A 158 °F (70 °C) 250 V DC-13 IEC 60947-5-1/1991<br />0.1 A 158 °F (70 °C) 250 V DC-13 VDE 0660<br />0.3 A 158 °F (70 °C) 115 V DC-13 IEC 60947-5-1/1991<br />0.3 A 158 °F (70 °C) 115 V DC-13 VDE 0660 |
| Maximum switching voltage | 440 V AC | Setting accuracy of the switching threshold | +/-3 % |
| Switching threshold drift | <= 0.06 % per degree centigrade depending permissible ambient air temperature<br /><= 0.5 % within the measuring range | Setting accuracy of time delay | 10 P |
| Time delay drift | <= 0.07 % per degree centigrade depending on the rated operational temperature<br /><= 0.5 % within the measuring range | Hysteresis | 50 % fixed asymmetry percentage |
| delay at power up | 650 ms | Maximum measuring cycle | 80 ms |
| Adjustment of asymmetry threshold | 5...15 % | [Ui] rated insulation voltage | 500 V IEC |
| Supply frequency | 50/60 Hz +/- 5 % | Operating position | Any position without derating |
| Connections - terminals | Screw terminals, 2 x 1.5 mm²flexible with cable end<br />Screw terminals, 2 x 2.5 mm²flexible without cable end | Tightening torque | 5.3…9.7 lbf.in (0.6…1.1 N.m) |
| Mechanical durability | 30000000 cycles | [Ith] conventional free air thermal current | 8 A |
| Switching capacity in mA | 10 mA 12 V | Switching voltage | 250 V AC |
| Contacts material | 90/10 silver nickel contacts | Number of cables | 2 |
| Height | 3.07 in (78 mm) | Width | 0.9 in (22.5 mm) |
| Depth | 3.1 in (80 mm) | Terminals description ISO n°1 | (25-26-28)OC<br />(15-16-18)OC<br />(L1-L2-L3)CO |
| Output relay state | Tripped, fault present | 9 mm pitches | 2.5 |
| Net Weight | 0.24 lb(US) (0.11 kg) | Time delay on de-energisation | 0.1…10 s |
| Electromagnetic compatibility | Electrostatic discharge - test level: 6 kV level 3 (contact discharge) conforming to IEC 61000-4-2<br />Electrostatic discharge - test level: 8 kV level 3 (air discharge) conforming to IEC 61000-4-2<br />Resistance to electrostatic discharge - test level: 6 kV (contact) conforming to IEC 61000-4-2 level 3<br />Resistance to electrostatic discharge - test level: 8 kV (air) conforming to IEC 61000-4-2 level 3 | Standards | EN/IEC 60255-6 |
| Product Certifications | GL<br />CSA<br />UL | marking | CE |
| Directives | 73/23/EEC - low voltage directive<br />89/336/EEC - electromagnetic compatibility | Ambient Air Temperature for Storage | -40…185 °F (-40…85 °C) |
| Ambient air temperature for operation | -4…149 °F (-20…65 °C) | Relative humidity | 15…85 % 3K3 IEC 60721-3-3 |
| Vibration resistance | 0.35 ms 10…55 Hz)IEC 60068-2-6 | Shock resistance | 15 gn 11 ms IEC 60068-2-27 |
| IP degree of protection | IP20 IEC 60529 terminals)<br />IP50 IEC 60529 casing) | Pollution degree | 3 IEC 60664-1 |
| Overvoltage category | III IEC 60664-1 | Dielectric test voltage | 2.5 kV |
| Non-dissipating shock wave | 4.8 kV | Resistance to electrostatic discharge | 6 kV contact IEC 61000-4-2 level 3<br />8 kV air IEC 61000-4-2 level 3 |
| Resistance to electromagnetic fields | 9.1 V/m (10 V/m) IEC 61000-4-3 level 3 | Resistance to fast transients | 2 kV IEC 61000-4-4 level 3 |
| Disturbance radiated/conducted | CISPR 11 group 1 - class A<br />CISPR 22 - class A |
Specifications may be subject to change without notice