Kriwan INT69 DMY 22A 407 S21 Motor Protection Module
Kriwan · INT69 DMY Series · Compressor Lockout Relay · In stock
The Kriwan INT69 DMY 22A 407 S21 is a German-engineered motor protection module from the
Kriwan INT69 family,
purpose-built for refrigeration and air-conditioning compressors. The unit monitors motor winding
temperature via a PTC chain, refrigerant leakage via a second PTC chain, three-phase sequence and phase
loss, and supply under-voltage / over-voltage. When any parameter drifts outside the safe envelope, the
integral lockout relay drops the compressor contactor and holds it out until the fault clears and a
manual or automatic reset is issued. The 22 A direct-contact rating covers most small-to-medium
hermetic and semi-hermetic compressors used in supermarket racks, cold storage, HVAC plants, process
chillers and transport refrigeration.
Kriwan refrigeration protection modules typically sit one tier below the
Allen-Bradley
and
Siemens
supervisory PLCs in a chiller or cold-room line, and are commonly deployed alongside
Mitsubishi
FX sequencing, Omron
CP1E plant-room control, and Schneider Modicon M340 chiller PLCs. For the full plant scope — PLCs,
HMIs, servo drives, vision systems and compressor protection — browse the complete
KOEED industrial automation catalogue.
1. Key Technical Specifications
| Brand |
Kriwan (Germany — refrigeration compressor protection specialist) |
| Series |
INT69 DMY — diagnostic, 2-phase + single-phase motor protection |
| Part Number |
INT69 DMY 22A 407 S21 |
| Module Type |
Motor Protection Module (compressor lockout relay) |
| Nominal Current |
22 A direct contact (compressor contactor switching) |
| Supply Voltage |
110–230 V AC, 50/60 Hz |
| Sensor Inputs |
1× PTC thermistor (motor winding), 1× leak sensor (PTC), 3-phase voltage sense |
| Monitoring Functions |
Winding over-temperature, refrigerant leak, phase sequence, phase loss, under-voltage, over-voltage |
| Output |
1× changeover relay contact (lockout / reset); terminals 11-12 NC, 11-14 NO |
| Reset Mode |
Manual or automatic (variant dependent) |
| Firmware / Sensor Code |
407 (firmware / variant code) · S21 (PTC thermistor input type 21) |
| Mounting |
35 mm DIN rail (control cabinet) |
| Operating Temperature |
-30 °C to +70 °C |
| Typical Application |
Refrigeration compressors, condensing units, cold rooms, chiller skids |
| Stock Status |
In stock — quote within 24 hours at
Moritta@KOEED.COM
|
2. Application Scenarios — Where It Fits
The INT69 DMY 22A 407 S21 is the de-facto protection relay for refrigeration and HVAC compressor
installations across multiple industry verticals. Typical deployments include:
-
Supermarket refrigeration racks — parallel compressor banks on Bitzer, Copeland, Frascold and Maneurop semi-hermetic units
-
Cold storage and walk-in freezers — multi-evaporator plants with three-phase scroll and reciprocating compressors
-
Industrial process chillers and HVAC plants — paired with
Schneider
Modicon M340 chiller PLCs and
Yaskawa
Σ-7 pump and condenser-fan drives
-
Transport refrigeration — refrigerated trucks, containers, last-mile delivery vans using Dorin and Embraco compressors
-
Pharma and food-grade plants — clean-room HVAC skid retrofits where leak detection is mandatory for refrigerant-loss compliance
-
CNC and machine-tool chiller skids — protecting the chiller compressor that cools
Fanuc
0i / 30i and
Allen-Bradley
ControlLogix-spindle lines
-
Legacy compressor retrofits — replacing Tecumseh and L’Unité Hermétique protective modules on 1990s-2000s condensing units
-
Compact refrigeration controllers — supervised by
Panasonic
FP0R, Omron
CP1E or Mitsubishi
FX3U for small plant rooms; the relay’s lockout contact feeds straight into the PLC fault input
-
Vision-inspected compressor assembly lines —
KEYENCE
CV-5000 / XG-8000 vision systems check the seal, the
Siemens
LOGO! runs the test sequence, and the Kriwan relay proves the compressor before the run-test station clears the unit
Browse the related
refrigeration compressor spare-parts
and
motor protection modules
categories for related Kriwan INT69 variants and matching contactor / overload kits.
3. Integration & Wiring Notes
The INT69 DMY is a hard-wired protective device, not a bus module — every connection is a
terminal screw. The five wiring zones below cover almost every field installation we see at
KOEED:
| Power supply (L1 / L2 / L3) |
Three-phase 110–230 V AC line voltage; the relay self-powers and derives the phase-sequence / phase-loss monitor from these terminals |
| Winding PTC (T1 / T2) |
Single PTC chain from the motor windings; cold resistance < ~250 Ω trip threshold ≈ 2.5 kΩ — over-temperature trips the lockout |
| Leak sensor (L1 / L2) |
PTC-type leak probe (Kriwan standard) senses refrigerant accumulation in the compressor housing or drip tray |
| Lockout output (11 / 12 / 14) |
11-12 NC (hold the compressor contactor closed during normal operation), 11-14 NO (alarm to the supervisory PLC) |
| PE / shield |
Tie the sensor cable shield to PE at the cabinet end only (single-point grounding) to avoid ground-loop noise on the high-impedance PTC inputs |
Practical wiring pitfalls we see in the field: (a) PTC and leak conductors routed in the same tray
as VFD output cables — induced common-mode noise will cause nuisance trips; (b) using the 22 A
output to switch a 60 A compressor contactor coil directly (it will, but the contact life drops
sharply — pilot an external contactor for anything above 22 A); (c) running the relay off a
single phase with a jumper to L2/L3 — phase-loss detection then becomes a nuisance trip on every
brown-out, so use the relay on a properly balanced three-phase feed.
4. Installation & Commissioning Tips
-
Mount vertically on a 35 mm DIN rail inside the control cabinet, away from contactor coils and VFD output cabling. Leave at least 25 mm above and below for airflow.
-
Set the reset-mode jumper (manual vs. automatic) before applying power — the position is read at start-up and latched until the next power cycle.
-
First power-up without the compressor: apply control voltage, watch the green LED sequence (ready → run → fault), and confirm 11-12 closes within 3 seconds.
-
Force a trip test: terminate the PTC input with a 4 kΩ resistor and confirm the relay drops the contactor within 1 second and latches in the fault state.
-
Verify phase sequence by swapping any two of L1/L2/L3 and confirming the relay refuses to close the contactor — this is the only reliable way to prove phase-sequence protection at commissioning.
-
Record the firmware code (407) and sensor type (S21) on the panel drawing and on the asset register — Kriwan’s catalog is keyed off those two digits and the wrong code will not accept the same sensor chain.
-
Reset procedure: cycle control voltage OFF for at least 5 seconds (manual reset) or wait out the auto-reset timer (typically 5–10 minutes, depending on variant).
-
Annual PM: torque the terminal screws, blow out dust with low-pressure dry air, and exercise the lockout by simulating a PTC trip — the same procedure is recommended in the
Kriwan INT69 DMY service manual.
-
Spare-parts strategy: keep one relay on the shelf for every ten compressors in the plant — INT69 lockouts are the most common single-point-of-failure on a refrigeration skid, and the panel builder’s lead time is the bottleneck, not the relay itself.
If you are unsure which firmware / sensor code to order, the
KOEED AI Diagnostic Tool
can read a nameplate photo and propose the matching Kriwan variant in seconds.
5. Procurement, Warranty & Lead Time
| Availability |
In stock at KOEED — ships from our China / Hong Kong warehouse with DHL / FedEx / UPS |
| Warranty |
12-month limited warranty on industrial automation spares; refurbished units ship with a separate warranty card |
| Quote Turnaround |
Within 24 hours on business days when the BOM / instruments list is emailed to Moritta@KOEED.COM |
| Lead Time (non-stocked) |
Typically 2–4 weeks from the EU warehouse for non-stocked Kriwan INT69 variants |
| BOM Quotation |
Send the full refrigeration and compressor BOM to Moritta@KOEED.COM and KOEED quotes the entire instrument list in one pass — no need to split the RFQ across multiple vendors |
| Cross-Reference |
Hard-to-find / EOL Kriwan variants are cross-referenced against the KOEED nine-brand matrix (Allen-Bradley, Siemens, Mitsubishi, Omron, Fanuc, Schneider, Yaskawa, Panasonic, KEYENCE) when a refrigeration-specific part is out of production |
| Sourcing Model |
KOEED is an independent multi-brand channel partner — not an OEM subsidiary of Kriwan, Allen-Bradley, Siemens or any other listed brand |
Need a Kriwan INT69 DMY 22A 407 S21 or a full refrigeration BOM?
Send your part list to Moritta@KOEED.COM and get availability + price within 24 hours.
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> Need to identify an unknown Kriwan part or propose a Kriwan INT69 cross-reference?
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Related searches on KOEED:
refrigeration compressor spare parts ·
motor protection modules ·
Bitzer compressor spares ·
Copeland compressor spares ·
Frascold compressor spares ·
Maneurop compressor spares ·
Kriwan INT69 DMY 22A 407 S21 product page ·
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KOEED is an independent industrial-automation channel partner — not an OEM subsidiary of Kriwan, Allen-Bradley, Siemens, Mitsubishi, Omron, Fanuc, Schneider, Yaskawa, Panasonic or KEYENCE. All brand names and part numbers are the property of their respective owners and are used for identification purposes only. Send your BOM to Moritta@KOEED.COM and our
KOEED team
will reply with availability and quotation within 24 hours on business days. See also
our gallery
for product photos of recent Kriwan INT69 shipments.
