CPR-126 Multispan
Multispan CPR-126 Current Protection Relay – True RMS, Overload/Underload, CT Input
Three-phase True RMS current protection relay with overload, underload, asymmetry, and single-phase prevention features, supporting 5–999A CT ratios with programmable delays for industrial motor and load protection.
The Multispan CPR-126 is a highly reliable True RMS current protection relay designed for three-phase industrial applications. It provides complete motor and load protection with programmable overload, underload, asymmetry, and single-phase prevention features, making it ideal for pump panels, motor starters, and automation systems.
Key Features
True RMS Measurement for accurate motor current monitoring
Protection modes as per datasheet page 1:
Overload / Overcurrent
Underload / Under-current
Current Asymmetry
Single-Phase Prevention (relay trips if any phase becomes zero)
Selectable Primary CT range: 5 to 999 A
Secondary CT input: 0.5–5A AC
Programmable time parameters:
Power-on delay
Trip delay
Initial delay
Recovery time (auto reset)
Auto or Manual reset modes
3-digit bright LED display for phase current indication
Individual R/Y/B phase LEDs and relay status LED
Compact DIN-rail mount enclosure
Supply voltage: 100–270V AC (wide range)
1× potential-free relay output (NO-C-NC), 10A rated
Technical Specifications (Table)
| Parameter | Specification |
|---|---|
| Primary CT Range | 5–999A selectable |
| Secondary Current | 0.5–5A AC |
| Resolution | 0.01A / 0.1A / 1A |
| Measurement Type | True RMS |
| Display | 3-digit, 7-segment, 0.4" Red LED |
| Protection | Overcurrent, undercurrent, Asymmetry, single-phase prevention |
| Relay Output | 1 C/O (NO-C-NC), 10A @ 230V AC/28V DC |
| Auxiliary Supply | 100–270V AC, 50–60 Hz |
| Power Consumption | 3 VA max |
| Time Settings | Power-on delay: 0–99 s, Trip delay: 0–999 s, Initial delay: 0–99 s, Recovery time: 0–99 s |
| Operating Temperature | 0 to 55°C |
| Humidity | Up to 95% RH, non-condensing |
| Dimensions | 75(H) × 45(W) × 110(D) mm |
| Mounting | DIN-rail |
Applications
Motor protection panels
Industrial pumps (dry-run & overload protection)
Compressors and chillers
HVAC systems
Conveyor systems
Machine tools
Automation & process control panels
What’s in the Box?
Multispan CPR-126 Relay
Terminal clamp / mounting guide
Instruction manual with wiring diagram
Warranty information sheet
FAQ
Q1. Does CPR-126 support single-phase prevention?
Yes. It trips the relay if any phase current becomes zero (datasheet page 1).
Q2. Can I use a CT with 5A secondary?
Yes, it supports 0.5–5A AC secondary current.
Q3. What protections can be enabled?
Overcurrent, undercurrent, asymmetry, and single-phase prevention are individually configurable.
Q4. What time settings can be adjusted?
Power-on delay, trip delay, initial delay, and recovery time.
Q5. Does it use true RMS measurement?
Yes, ensuring accurate readings even with nonlinear loads.
Q6. Is auto reset available?
Yes, relay reset can be manual or auto, selectable via parameters.